Earthquake!

[dale leigh]

My 1st thought also !!

We've had few "happenings" of late (house built in 1642) I thought our "Old Man" (as my daughters call him/it) had decided to give my bed a shake again.

My dog was unusually bouncy also last night, she wouldn't settle at all.

hi our dog was restless too and just before the quake it ran into the kitchen. i was up stairs and the room shook violently with wardrobes moving and the room swaying. really scary.

Dale Leigh Hyde cheshire.

[mackerel sky]

Didnt the 2002 Dudley Earthquake happen at 12.55am too?

Almost. Dug out the phase data for the Dudley earthquake and the two aftershocks. These have been relocated by me and form three of over a thousand events from the past 25 years I've used to develop 3-D tomographic models of the seismic velocity of the crust beneath England and Wales (to try to understand the distribution of earthquakes in UK) working with the people you may have seen or heard from the BGS today on TV or on radio. Some generous rounding up I note across the press with regards the Dudley earthquake upto a magnitude 5. I believe it was a magnitude 4.7/4.8. I have it in the header as a 4.7. The times given in the header are an hour behind because of BST, so the main Dudley shock was at 12.53am on the 22nd of September 2002. The rest you can work out for yourself. Then there is a list of stations on the monitoring network with the first (P-) and second (S-) arrivals picked (in some instances were clear, because the onset of the S- wave is often obscured by the P-wave, particularly at short distances away). These first arrival picks are then used in the location program.

2002 922 2353 14.72L 52.529 -2.164 14.0F LWN 91 0.5 4.7LLWN 1

GAP= 34 0.85 1.5 2.6 0.0 -0.1407E+00 0.7065E+01 -0.1689E+01E

8.0000 81.0000 -12.0000 3 0.0 0.0 FOCMEC F

FELT ENGLAND & WALES 3

DUDLEY,W MIDLANDS 5 23

STAT SP IPHASW D HRMM SECON CODA AMPLIT PERI AZIMU VELO AIN AR TRES W DIS CAZ7

KWE SZ IP C 2353 24.50 98 -0.210 58.4 22

HAE SZ IP C 2353 24.74 98 -0.310 60.6 205

CWF SZ IP C 2353 24.96 97 -0.310 62.5 68

SSP SZ IP C 2353 26.00 97 0.210 65.6 260

SSW SZ IP D 2353 25.80 97 -0.110 66.1 161

HBL2 AZ EP 9 2353 27.97 96 79.9 229

HBL2 AE ES 2 2353 37.51 79.9 229

HBL2 AE AMPL 2353 39.15 14335.7 0.26 79.9 229

HBL2 AN AMPL 2353 39.52 10522.4 0.22 79.9 229

KEY2 AZ EP 9 2353 29.34 95 0.9 0 83.1 62

KEY2 AN AMPL 2353 29.80 26260.2 0.14 83.1 62

KEY2 AE AMPL 2353 29.80 50813.1 0.14 83.1 62

KEY2 AN ES 1 2353 39.11 -0.3 7 83.1 62

MATA SZ IP 2353 29.47 95 0.710 85.0 344

SBD SZ IP D 2353 29.33 95 0.510 85.0 300

HTR SZ IP C 2353 29.35 67 -0.210 90.5 237

KBI SZ IP C 2353 29.60 67 -0.110 91.4 28

HGH SZ IP C 2353 32.28 67 0.1 9 108 204

LHO SZ EP 2353 33.56 67 0.4 9 115 10

SWN SZ IP D 2353 33.48 67 0.3 9 116 167

SWN AZ EP 9 2353 34.34 67 1.2 0 116 167

SWN AE ES 2 2353 47.83 0.0 5 116 167

SWN AE AMPL 2353 50.03 23184.7 0.59 116 167

SWN AN AMPL 2353 50.31 13073.5 0.29 116 167

KSY SZ IP C 2353 33.51 67 0.2 9 117 65

KUF SZ IP C 2353 33.77 67 -0.1 9 121 85

KTG SZ IP D 2353 34.18 67 0.1 9 122 100

WFB SZ IP D 2353 35.79 67 0.8 9 128 278

SKP SZ IP D 2353 35.02 67 -0.1 9 129 134

WPM SZ IP D 2353 37.24 67 0.2 9 143 305

LDU AN AMPL 2353 56.97 19690.8 0.31 148 16

LDU AN ES 4 2353 56.97 67 2.4 0 148 16

LDU AE AMPL 2353 57.58 35142.1 0.33 148 16

WOL BZ EP 9 2353 58.69 67 150 154

WOL BN AMPL 2354 49.38 5733.9 0.62 150 154

WOL BE AMPL 2354 55.55 3904.0 0.50 150 154

YLL SZ IP D 2353 38.24 67 0.0 8 151 297

SWK SZ IP D 2353 39.34 67 0.7 8 154 182

YRE SZ IP D 2353 39.72 54 0.2 8 161 289

HSA SZ EP C 2353 39.71 54 0.1 8 161 238

HPK SZ EP 2353 39.99 54 0.2 8 163 13

YRH SZ EP 2353 40.95 54 0.2 8 170 282

WLF SZ EP D 2353 40.79 54 -0.1 8 172 300

WME SZ EP D 2353 41.08 54 0.0 8 173 305

YRC SZ EP D 2353 42.00 54 0.0 8 181 297

WCB SZ EP D 2353 42.73 54 0.1 7 186 301

HPE SZ EP 2353 43.17 54 0.0 7 190 251

HEX SZ IP C 2353 44.40 54 0.2 7 198 215

LMI SZ EP D 2353 44.44 54 -0.3 7 203 338

LRN SZ EP D 2353 45.98 54 0.1 7 211 6

AWH SZ EP C 2353 46.21 54 0.4 7 211 86

TSA SZ EP D 2353 46.68 54 0.5 7 214 131

LWH SZ IP C 2353 47.75 54 0.3 7 224 26

CSF SZ EP D 2353 47.20 54 -0.5 7 225 342

ABA SZ EP C 2353 48.21 54 0.4 6 227 79

AEU AE ES 4 2354 17.46 54 4.8 0 231 86

AEU AE AMPL 2354 17.46 14913.8 0.39 231 86

AEU AN AMPL 2354 17.49 16871.7 0.26 231 86

HTL SZ EP C 2353 48.56 54 -0.1 6 234 224

XDE SZ EP D 2353 48.54 54 -0.5 6 237 339

CKE SZ EP D 2353 48.86 54 -0.3 6 238 345

TEB SZ EP D 2353 50.73 54 0.3 6 248 139

GIM SZ EP D 2353 49.93 54 -0.6 6 249 323

LCP SZ EP D 2353 50.63 54 0.0 6 250 10

BBO SZ IP D 2353 51.14 54 -0.3 6 256 344

BBO SN AMPL 2354 31.11 2985.3 0.48 256 344

BBO SE AMPL 2354 34.14 3760.9 0.63 256 344

BDL SZ EP D 2353 51.61 54 -0.1 6 258 349

XAL SZ EP 2353 51.72 54 -0.2 6 260 359

DYA SZ IP C 2353 51.65 54 -0.7 6 263 208

BTA SZ EP D 2353 52.62 54 -0.2 6 267 353

TFO SZ EP 4 2353 54.99 54 1.0 0 277 123

GCD SZ EP D 2353 54.25 54 -0.8 5 285 336

BCC AZ AMP 2353 48.93 285 346

DSB BN AMPL 2354 42.01 623.0 0.31 294 287

BBH SZ EP D 2353 55.79 54 -0.4 5 294 350

DSB BE AMPL 2354 41.15 889.2 0.31 294 287

DSB BE ES 4 2354 41.15 54 14.6 0 294 287

BHH SZ EP D 2353 55.55 54 -0.6 5 294 347

BHH SN AMPL 2354 42.29 6939.4 0.69 294 347

BHH SE AMPL 2354 43.03 5735.6 0.54 294 347

CSA SZ EP 2 2353 56.98 54 -0.9 2 308 219

GAL SZ EP 2 2353 57.45 54 -0.7 2 310 328

GMM SZ EP D 2353 58.10 54 -0.8 4 316 309

ESK SZ EP D 2353 58.48 54 -0.7 4 318 348

CST SZ EP C 2353 59.71 54 -1.3 4 333 220

CR2 SZ EP 2354 0.09 54 -1.3 4 336 220

CCA SZ EP C 2354 0.16 54 -1.4 4 337 221

CGW SZ EP C 2354 1.19 54 -1.2 4 344 219

CGH SZ EP C 2354 1.44 54 -1.2 4 346 218

JQE SZ EP 2354 4.55 54 -1.1 3 370 179

JRS SZ EP 2354 4.61 54 -1.2 3 371 179

ESY SZ EP 1 2354 6.38 54 -0.4 2 378 356

EAU SZ EP D 2354 6.81 54 0.0 3 379 348

PCA SZ EP D 2354 5.76 54 -1.0 3 379 340

EDI SZ EP 2354 7.15 54 -0.2 3 384 350

GMK SZ EP D 2354 6.53 54 -1.1 3 386 326

PCO SZ EP D 2354 9.28 54 -0.8 2 405 343

PMS SZ EP D 2354 8.96 54 -1.2 2 406 337

EAB SZ EP D 2354 12.13 54 -1.2 2 431 342

EDU SZ EP 2354 15.52 54 -0.3 1 451 353

EDR SZ EP 2354 19.89 54 -0.7 0 489 357

MME SZ EP 1 2354 25.62 54 -0.8 0 535 355

MCD SZ EP 1 2354 29.52 54 -0.8 0 567 353

MVH SZ EP 1 2354 35.17 54 -1.0 0 614 349

RRR SZ EP 2 2354 38.15 54 -0.8 0 637 340

REB SZ EP 2 2354 40.08 54 -0.9 0 653 344

RRH SZ EP 2354 41.07 54 -1.5 0 665 336

ORE SZ EP 2354 42.76 54 -1.4 0 678 352

RTO SZ EP 2354 45.63 54 -1.2 0 699 340

RCR SZ EP 1 2354 46.13 54 -1.0 0 702 346

OST SZ EP 1 2354 49.18 54 -1.5 0 731 358

WAL SZ EP 1 2355 4.64 54 -2.4 0 861 2

YEL SZ EP 1 2355 8.86 54 -2.5 0 896 4

2002 923 0332 15.94L 52.543 -2.152 9.7S NHW 19 0.4 2.7LNHW 1

GAP= 77 0.64 2.5 3.0 5.7 -0.1042E+01 0.2942E+01 0.2204E+01E

FELT DUDLEY... 3

DUDLEY,W MIDLANDS 3+ 23

STAT SP IPHASW D HRMM SECON CODA AMPLIT PERI AZIMU VELO AIN AR TRES W DIS CAZ7

KWE SZ EP 2 332 25.73 97 0.2 5 56.7 22

CWF SZ IP C 332 26.09 96 -0.210 61.1 69

CWF SE ES 2 332 33.48 96 0.1 5 61.1 69

HAE SZ EP 2 332 25.87 96 -0.6 5 62.3 206

SSP SZ EP 2 332 27.13 96 -0.1 5 66.7 258

SSP SE ES 2 332 35.37 96 0.5 5 66.7 258

SSW SZ EP 2 332 27.06 96 -0.2 5 67.3 162

KEY SZ EP 2 332 29.70 94 0.1 5 81.7 62

MCH SZ EP 3 332 29.49 94 -0.4 2 83.8 224

SBD SZ IP C 332 30.51 69 0.410 85.0 299

KBI SZ EP 2 332 30.93 69 0.1 5 89.6 28

HTR SZ EP 2 332 30.48 69 -0.7 5 92.0 236

HGH SZ EP 2 332 33.46 69 -0.5 5 110 204

KSY SZ EP 2 332 34.76 69 0.0 5 116 65

SWN SZ EP 2 332 35.00 69 0.0 5 117 168

SWN SN ES 2 332 49.24 69 1.3 5 117 168

SWN SN AMPL 332 50.10 209.3 0.15 117 168

SWN SE AMPL 332 50.25 261.8 0.57 117 168

KUF SZ EP 2 332 34.93 69 -0.5 5 120 85

KTG SZ ES 2 332 49.42 69 0.3 5 121 101

WPM SZ EP 2 332 38.51 69 -0.4 4 142 305

YLL SZ EP 2 332 39.69 69 -0.5 4 151 297

SWK SZ EP 2 332 40.71 49 0.0 4 155 182

WCB SZ EP 2 332 44.26 49 -0.3 4 186 301

WCB SN AMPL 333 8.05 58.7 0.22 186 301

WCB SE AMPL 333 9.27 51.2 0.25 186 301

2002 924 0929 19.14L 52.518 -2.137 7.9S NHW 7 0.1 1.2LNHW 1

GAP=139 0.14 0.7 1.0 2.2 -0.4121E+00 0.4115E+00 0.1562E+00E

ACTION:SPL 06-08-02 11:47 OP:AJH STATUS: ID:20020924092937 I

2002-09-24-0929-17S.HFQ___016 6

2002-09-24-0929-26S.KWQ___013 6

2002-09-24-0929-45S.NWQ___016 6

DUDLEY,W MIDLANDS 23

3

STAT SP IPHASW D HRMM SECON CODA AMPLIT PERI AZIMU VELO AIN AR TRES W DIS CAZ7

KWE SZ IP D 929 29.02 97 0.010 58.9 20

HAE SZ IP D 929 29.32 97 0.010 60.3 208

CWF SZ IP C 929 29.42 96 0.010 61.2 66

CWF SN ES 2 929 36.59 96 0.1 5 61.2 66

CWF SE AMPL 929 36.75 20.0 0.07 61.2 66

CWF SN AMPL 929 36.77 24.9 0.11 61.2 66

SSP SZ EP 2 929 30.31 96 -0.1 5 67.2 261

SSP SN ES 2 929 38.26 96 0.1 5 67.2 261

SSP SE AMPL 929 38.84 10.4 0.22 67.2 261

SSP SN AMPL 929 38.93 11.4 0.19 67.2 261

SBD SZ EP 2 929 33.79 69 0.1 5 87.2 300

KBI SZ EP 3 929 34.47 69 0.1 2 91.6 26

HGH SZ EP 1 D 929 36.83 69 -0.1 7 108 205

A trial hypocentre (focus + origin time) is usually given by the location station with the shortest P-onset as recorded on the network, which is sub-divided and triggered on a local basis. The trial hypocentre is then iteratively updated until the misfit between the observed and calculated travel-times (based on an a-priori 1-D velocity model - which is why we need 3-D models) is minimised in a least squared sense. More stations mean better azimuthal coverage, hence preliminary estimates until the full set of waveform data from all stations becomes available.

Hope that gives some insight and quite frankly I don't know why I bother because no one ever reads my posts.

Edited February 27, 2008 by mackerel sky

[I remember Atlantic 252]

heard it at 00.56 ish seemed like a bang, the olly earthquake i remember, thought afterwards it was just the wind as it was very windy, i had nothing falling but folks i work with did, seemed like it was less here at wildwood

[Dartmoor_Matt]

Didn't feel it down here, but felt one a few years back centred in North Devon.

As to the comment above that the UK doesn't get very many - on average we have 200 a year, just most aren't felt.

Edit: Interestingly that was back in 2001, 3.6 on the scale and was at .... yup 1am

Edited February 27, 2008 by Dartmoor_Matt

[TEITS]

Just checking my local newspaper and it seems there has been 3 earthquakes in recent times these being 1992 (epicentre in Peterborough), 2002, and of course last nights quake.

According to some expert, Peterborough is especially vunerable to earthquakes due to several fault lines with a deep seated one on the outskirts of the city.

http://www.peterboroughtoday.co.uk/news/Ea...city.3820968.jp

Seems like some couple in Peterborough are suffering from structual damage to their house (see pics in link) or is the wife causing this :lol:

[PersianPaladin]

Mackerel Sky; you can be assured that I have read every single one of your posts and found them to be most interesting and useful. I've even forwarded one of the research links on to some co-geography graduate friends who are interested in this area.

[mackerel sky]

If anyone in interested into a more thorough explanation of what is contained there then please ask. As will be the same case for today's event, once picked the phase data is organised according to station and distance/time from the header downwards. Only in the case of severe anisotropy in the crust would this differ. Most of the phases relate to P-arrivals, with usually about 33% S-arrivals. The others relate to the peak to peak amplitude picked on the waveforms to determine the magnitude of the event. I have kept the amplitudes as determined at the time, but the back-catelogue of earthquakes (f.e the Dudley event) has been relocated with a 3-D model of seismic P- and S- velocity. The models used to provide the locations of say, todays event are 1-D models, that may be rather inaccurate. This is particularly true for eastern and southern England where there is little constraint from wide angle refraction profiles, because simply none have ever been shot in this area. Most of the 1-D models used to locate events in the UK are derived from refraction profiles shot in the 1970s (LISPB, Bamford et al.).

So there is still much work to be done. The largest errors in earthquake location are associated with depth. You can alter the depth alot but not affect the travel-time much, but change its spatial position in x and y it will.

Right i'm shutting up now, and going back to work.

Mackerel Sky; you can be assured that I have read every single one of your posts and found them to be most interesting and useful. I've even forwarded one of the research links on to some co-geography graduate friends who are interested in this area.

Cheers mucka'. This is my area, British earthquakes and improving locations and understanding the distribution. I've spent the last 3 1/2 years of my life doing it - so when there is an absolute silence in response, I tend to assume people think i'm spouting nonsense.

[mackerel sky]

Just checking my local newspaper and it seems there has been 3 earthquakes in recent times these being 1992 (epicentre in Peterborough), 2002, and of course last nights quake.

Just for you...

1992 217 0122 33.22L 52.505 -0.206 15.0 HLWN 56 0.5 3.2LLWN 5.0BLWN 1

GAP= 69 0.55 1.6 2.2 2.6 0.1163E+01 -0.6056E+00 0.5175E+00E

FELT CAMBRIDGESHIRE... 3

F 5 EM 2

PETERBOROUGH,CAMBS 5 23

9202-17-0121-59.W_KEY_12 6

9202-17-0122-42.W_HFV_11 6

9202-17-0122-55.W_NWV_15 6

9202-17-0123-15.W_LNV_12 6

9202-17-0123-09.W_CNV_12 6

9202-17-0122-04.W_EAN_07 6

9202-17-0124-01.W_JGR_12 6

9202-17-0122-59.W_ESK_11 6

9202-17-0121-46.W_LDS_12 6

9202-17-0121-00.W_CRH_12 6

9202-17-0121-60.W_HER_12 6

9202-17-0122-05.W_SEN_12 6

ACTION:SPL 06-08-02 11:47 OP:AJH STATUS:LC ID:19920217012204 I

STAT SP IPHASW D HRMM SECON CODA AMPLIT PERI AZIMU VELO AIN AR TRES W DIS CAZ7

KUF SZ IP D 122 36.95 115 -0.210 17.7 315

KTG SZ IP U 122 37.54 108 -0.510 23.9 214

KSY SZ IP D 122 42.96 95 0.010 57.2 333

KEY SZ EP 122 45.32 94 0.110 72.0 306

KEY SZ ES 2 122 54.21 94 0.1 5 72.0 306

CWF SZ IP D 122 46.14 94 -0.210 79.0 290

TBW SZ IP D 122 49.59 93 0.110 101 160

TBW SZ ES 2 123 1.87 93 0.6 5 101 160

ABA SZ IP U 122 49.35 93 -0.110 101 64

LMK SZ EP 1 122 50.70 67 0.4 7 106 356

TCR SZ IP D 122 50.05 67 -0.3 9 107 134

APA SZ IP D 122 51.52 67 -0.2 9 117 101

APA SZ ES 2 123 5.94 67 0.6 5 117 101

AWI SZ IP U 122 52.05 67 0.2 9 118 71

KBI SZ IP 1 D 122 52.77 67 0.2 7 122 314

KWE SZ EP 1 D 122 53.30 67 0.4 7 124 298

TSA SZ EP 2 122 55.99 67 0.5 4 143 170

LHO SZ EP 3 122 57.69 54 -0.2 2 160 317

HAE SZ EP 2 122 59.26 54 0.4 4 168 253

TFO SZ EP 1 D 123 0.51 54 0.1 6 181 149

TFO SE ES 2 123 21.22 54 0.9 4 181 149

HLM SZ EP 3 123 0.83 54 0.2 2 182 272

HPK SZ EP 3 123 0.94 54 -0.3 2 187 330

HPK SE ES 3 123 20.81 54 -1.0 2 187 330

TEB SZ EP 2 123 1.71 54 0.3 4 189 172

SSP SZ EP 2 U 123 2.79 54 0.2 4 198 268

SSP SE ES 3 123 25.40 54 1.3 2 198 268

SSP SE 123 27.39 393. 0.16 198 268

SSP SN 123 28.02 391. 0.35 198 268

MCH SZ EP 1 U 123 2.84 54 0.1 5 199 255

MCH SN ES 2 123 26.25 54 2.0 4 199 255

MCH SN 123 31.72 239. 0.14 199 255

MCH SE 123 33.02 226. 0.18 199 255

HBL2 SZ EP 4 123 28.82 144. 0.46 54 26.0 0 200 256

HGH SZ IP 1 U 123 3.18 54 0.0 5 203 243

SBD SZ EP 2 123 4.84 54 0.5 3 211 283

HTR SZ EP 2 U 123 4.67 54 0.0 3 214 258

HCG SZ EP U 123 7.48 54 0.1 6 236 266

WFB SZ EP 2 123 10.64 54 0.2 3 260 276

WPM SZ EP 2 123 10.47 54 -0.2 3 263 290

YLL SZ EP 2 123 12.04 54 -0.3 3 276 286

YRE SZ EP 2 123 13.92 54 -0.1 2 290 282

WME SZ EP 2 123 14.05 54 -0.4 2 293 291

WLF SZ EP 2 123 14.53 54 -0.2 2 295 289

YRH SZ EP 2 123 15.51 54 0.0 2 301 279

YRC SZ EP 2 123 15.75 54 -0.3 2 306 287

WCB SZ EP 2 123 16.24 54 0.0 2 308 290

WCB SN ES 2 123 47.97 54 0.2 2 308 290

WCB SE 124 4.04 81. 1.23 308 290

WCB SN 124 10.20 77. 0.78 308 290

WIM SZ EP 2 123 20.85 54 -0.7 2 349 303

ECK SZ EP 2 123 21.47 54 -0.7 2 355 328

XSO SZ EP 3 123 22.37 54 -0.4 1 359 339

ESK SZ EP 4 123 23.87 54 -0.2 0 370 329

ESK SN 124 3.03 59. 0.56 370 329

ESK SE 124 25.44 72. 0.67 370 329

CSA SZ EP 3 123 27.08 54 -1.3 1 404 236

EBL SZ EP 3 123 28.56 54 -0.4 1 408 334

ESY SZ EP 2 123 28.70 54 -0.6 1 411 338

EDI SZ EP 123 31.36 54 0.1 2 427 334

EDI SZ IP 2 123 31.37 54 0.1 1 427 334

EDI SN ES 2 124 13.84 54 0.2 1 427 334

EDI SE 124 16.47 38. 0.70 427 334

EDI SN 124 17.43 56. 0.57 427 334

EAU SZ EP 3 123 31.36 54 0.0 0 428 332

CST SZ EP 1 U 123 30.17 54 -1.4 1 430 235

CBW SZ EP 2 123 30.17 54 -1.5 1 431 234

CR2 SZ EP 1 U 123 30.47 54 -1.4 1 433 235

CME SZ EP 3 123 30.51 54 -1.5 0 433 235

CME SN ES 2 124 12.19 54 -2.7 1 433 235

CR2 SN ES 124 12.61 54 -2.2 2 433 235

CR2 SE 124 16.17 19. 0.23 433 235

CR2 SN 124 17.97 14. 0.24 433 235

CCA SZ EP 2 123 30.70 54 -1.5 1 434 236

CCO SZ EP 2 123 30.82 54 -1.5 1 436 235

CGH SZ EP 2 123 31.48 54 -1.4 1 441 234

EBH SZ EP 2 123 35.96 54 -0.5 0 469 334

EDU SZ EP 2 123 38.30 54 -0.2 0 485 339

EAB SZ EP 2 123 38.47 54 -0.7 0 490 328

ELO SZ EP 2 123 39.24 54 -0.7 0 496 334

EDR SZ EP 2 123 41.16 54 -1.0 0 514 344

The 1992 event is not coincident with any major fault. Infact few of any significance exist in eastern England. But little is known about the deeper geology, and most earthquakes - take for example this one in 1992 occurred in the mid-crust probably at similar depths to todays. Its much easier, particularly in the West Midlands, the Welsh Borderlands, mid- and northern-Wales to correlate the pattern of seismicity to the traces of surface faults (even though it it still taking place in the mid-crust). No surface rupture has ever been historically recorded. Although, clearly when you look at major features in geological past like the Church Stretton Fault, the Malvern axis, the Menai Straits Fault system etc etc, at some point these formed significant terrane boundaries. Problem with eastern and south-eastern England its all covered up with superficial post-Mesozoic sediments.

I think if you go way way back to almost the start of the thread you will see a figure I posted, which has the Peterborough event on, and the fault lineaments.

Edited February 27, 2008 by mackerel sky

[M'Lady]

Cheers mucka'. This is my area, British earthquakes and improving locations and understanding the distribution. I've spent the last 3 1/2 years of my life doing it - so when there is an absolute silence in response, I tend to assume people think i'm spouting nonsense.

Personally Mackerel, I find the parts of your posts that I can understand interesting but I haven't replied to them because, well, I'm far less knowlegable than you about earthquakes and presumed you wouldn't find my ignorance a very stimulating response! Please don't get disheartened. :lol:

Locally I'd say about half the people I spoke to today were woken by the earthquake (myself and Lord P included) and the other half slept right through it (just like the Young Lords).

[mackerel sky]

Personally Mackerel, I find the parts of your posts that I can understand interesting but I haven't replied to them because, well, I'm far less knowlegable than you about earthquakes and presumed you wouldn't find my ignorance a very stimulating response! Please don't get disheartened. :lol:

Flippin' eck. I would have been grateful for any response and embraced it. This isn't after all, the model discussion thread. :lol:

Most of the people I know are drunkards, so little point asking them if they felt it.

In the Northants Evening Telegraph it follows the sorry tale of a Parrot that fell off its Perch and got a bloody beak in Kettering or somewhere.

Edited February 27, 2008 by mackerel sky

[Rustynailer]

That earth tremor in 84 seemed to wobble all over the place like blancmange, was this normal MS? :lol:

I didn't feel it because I am on the wrong strata, others on the island felt it, they were on chalk or clay near it. Like prof, John Milne pionearing earthquake recording site at Shide nr Newport (from 1895 to 1915 the world center for earthquake studies ), the clay next to the chalk downs is perfect for feeling and measuring earthquakes at good distances.

Good posts MS :lol: Although it still won't snow...

Regards,

Russ.

[mackerel sky]

That earth tremor in 84 seemed to wobble all over the place like blancmange, was this normal MS? :lol:

I didn't feel it because I am on the wrong strata, others on the island felt it, they were on chalk or clay near it. Like prof, John Milne pionearing earthquake recording site at Shide nr Newport (from 1895 to 1915 the world center for earthquake studies ), the clay next to the chalk downs is perfect for feeling and measuring earthquakes at good distances.

Good posts MS :lol: Although it still won't snow...

Regards,

Russ.

The 1984 Lleyn 5.4 ML event and aftershock sequence were exceptionally deep. The main shock despite attempts to relocate it still come in at about 20km depth. Some of the aftershocks even deeper. I didn't feel it, I was 8 years old and living near Middlesbrough. My wife did though, because she is from North Wales. As for Blancmange its a good analogy, I felt a little like that last night after standing up when the shaking first started. But the point you make about near surface geology is very correct... I live on the edge of lower Jurassic Oxford clay and it does accentuate ground motion. Bad examples of contrast include places like Wellington in New Zealand in terms of major or no damage. Liquefaction is the serious consequence in regions of unconsolidated versus consolidated rock. Would elaborate more, but must put tea on for Mrs Mackerel Sky before she gets in and settle down for the Boro match. Must dash.

Edited February 27, 2008 by mackerel sky

[stormchaser1]

Evening everyone

I havent scrolled back yet, not long been in from work.

Travelling to work this morning at around 0600hrs i heard the news about a Earthquake measuring 5.2 [centre being in Market Rasen} at 0800hrs i rang my parents has i was a bit concerned because they live in Boston {Lincs} when i spoke to my Father he said he had never been so scared in his life, he said he heard a rumble , and then the bungalow started to shake, he said it felt like a lorry was going straight throught the centre of the bungalow,, he reported no damaged , and all was well ,

Speaking to a few people here in the North East, today and they mentioned they felt something as well

Me well i was flat out , never heard a thing, TYPICAL

I also heard there could be another aftershock within the next 48hrs , what confidnece his this now , some reporters on radio Newcastle were saying it was a big possibility for these aftershockss

Nigel

Edited February 27, 2008 by stormchaser1

[disco-barry]

It only just scraped a five, not even worth waking for!

[PersianPaladin]

It only just scraped a five, not even worth waking for!

5.2

Thats not scraping a five.

[Rustynailer]

The 1984 Lleyn 5.4 ML event and aftershock sequence were exceptionally deep. The main shock despite attempts to relocate it still come in at about 20km depth. Some of the aftershocks even deeper. I didn't feel it, I was 8 years old and living near Middlesbrough. My wife did though, because she is from North Wales. As for Blancmange its a good analogy, I felt a little like that last night after standing up when the shaking first started. But the point you make about near surface geology is very correct... I live on the edge of lower Jurassic Oxford clay and it does accentuate ground motion. Bad examples of contrast include places like Wellington in New Zealand in terms of major or no damage. Liquefaction is the serious consequence in regions of unconsolidated versus consolidated rock. Would elaborate more, but must put tea on for Mrs Mackerel Sky before she gets in and settle down for the Boro match. Must dash.

Thanks, I hope the Boro win, for peace and quiets sake :lol:

Soon as I rebuild my ageing chimney, I will look forward to the next one :lol:

Regards,

Russ

[Gray-Wolf]

Page 1 or so of all this some 'wit' blames global warming for the quake.

If our globe is warming then would differential thermal expansion of crutal layers lead to more 'uncommon' earth movements as the crust 'settles/balences out' again?

We all know what happened to the French nuclear power stations in 2003 due to the heat so does the process exist on the 'macro ' scale???

[A.J]

Must admit, didnt feel a thing here...absolutley 'soundo'....however, the local rag reported that cracks appeared in a house here in Penkridge....odd, I just put that down to crappy builders

[Shiny_Bottom_1]

Interesting GW, but a couple of critical points:

Is there any evidence of warming at the depth of fault lines and/or plates?

Would the increase, if it did exist, have any effect on movement (i.e. would it cause sufficient expansions)?

Personally, I cant see it. But i'm not a seismologist (sp?).

[Gray-Wolf]

Interesting GW, but a couple of critical points:

Is there any evidence of warming at the depth of fault lines and/or plates?

Would the increase, if it did exist, have any effect on movement (i.e. would it cause sufficient expansions)?

Personally, I cant see it. But i'm not a seismologist (sp?).

I know the Yanks caused earthquakes in 'stable regions' by pumping redundant nerve gas in to those areas (leading to the interest in 'lubricating' the San Andreas fault to allow lots of teensy weensy quakes instead of enduring the mother of all quakes). If we have warmed the average temp of the surface of the globe then surely everything will expand?

How deep does this effect percolates and what of the differential expansion rates of different depths/rock types? I know it's only basic physics but surely it's sound???

Edited February 27, 2008 by Gray-Wolf

[MAF]

It only just scraped a five, not even worth waking for!

unless you was scared witless by the fact you had never experienced anything like it before!!

5.2 Thats not scraping a five.

no it isn't as most people who were woken by it would testify.

[Shiny_Bottom_1]

I know the Yanks caused earthquakes in 'stable regions' by pumping redundant nerve gas in to those areas (leading to the interest in 'lubricating' the San Andreas fault to allow lots of teensy weensy quakes instead of enduring the mother of all quakes). If we have warmed the average temp of the surface of the globe then surely everything will expand?

How deep does this effect percolates and what of the differential expansion rates of different depths/rock types? I know it's only basic physics but surely it's sound???

GW. Do you ever listen to Chris Moyles on Radio 1? Well, if you do, then you'll know what part of the programme I mean, if not, let me explain.

They have a section called tedious link (i'm not saying your point is tedious mind ). They take one song (e.g. Aqua - Barbie Girl), and go through a series of links to get to an end point/song that is not directly linked (e.g. Oasis - Wonderwall).

The point being GW, i'm sure there are many ways of linking GW and Earthquakes, but directly, I dont see it (I honestly dont see how we are capable of 'heating' the earth to a point where we can literally deform/expand/change the shape of the Earth. Can you?).

[Gray-Wolf]

unless you was scared witless by the fact you had never experienced anything like it before!!

no it isn't as most people who were woken by it would testify.

Though in life "words are easy and it is our actions that define us as men" on here we have just words so lets not be too harsh on P.P., who knows he may be a nice guy...............

[MAF]

Though in life "words are easy and it is our actions that define us as men" on here we have just words so lets not be too harsh on P.P., who knows he may be a nice guy...............

no mate, was not been harsh on PP. quite the opposite. i was actually agreeing with him. it was barry's flippant remark that i was replying to in a demeaning way.

[Gray-Wolf]

The point being GW, i'm sure there are many ways of linking GW and Earthquakes, but directly, I dont see it (I honestly dont see how we are capable of 'heating' the earth to a point where we can literally deform/expand/change the shape of the Earth. Can you?).

I'm only running with a notion but then all solids, when warmed, expand. their molecules have more energy and so move faster to the point of state change. We are only talking enths of a degree C but however small it must follow the basic lwas and expand. There is a lot of crust. However small the percentage of 'expansion' occuring when you scale it up to a continent it must add up to metre's of expansion at least?

no mate, was not been harsh on PP. quite the opposite. i was actually agreeing with him. it was barry's flippant remark that i was replying to in a demeaning way.

Sorry Mick , had a disturbed night last night (tee hee) so hadn't read your post properly. D.B. is mainly harmless too I believe!