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Physics of the Earth and Planetaiy Interiors, 50 (1988) 127—154 127 Elsevier Science Publishers By., Amsterdam Printed in The Netherlands Global seismicity of 1980: centroid-moment tensor solutions~ for 515 earthquakes A.M. Dziewonski, G. Ekström, J.E. Franzen and J. H. Woodhouse Department of Earth and Planetary Sciences, Hoffman Laboratory, Harvard University, Cambridge, MA 02138 (U.S.A.) (Received and accepted July 1, 1987) Dziewonski, A.M., Ekstrom, G., Franzen, J. E. and Woodhouse, J.H., 1988. Global seismicity of 1980: centroid-mo- ment tensor solutions for 515 earthquakes. Phys. Earth Planet. Inter., 50:127—154. Centroid-moment tensor solutions are presented for 515 earthquakes that occurred during 1980. The advent of digital seismometry made it pos- network; in the beginning of 1977 there were only sible to study the global-spatio-temporal pattern five operational SRO/ASRO stations. Actually, of stress release in a systematic and uniform way. under usual circumstances it is possible to obtain The first experiment consisting of determining satisfactory answers with only one station centroid-moment tensor (CMT) solutions for (Ekstrom et al., 1986). It became clear that the earthquakes with magnitude greater than or equal systematic analysis that we began after the Global to 5.5 was reported by Dziewonski and Woodhouse Digital Seismograph Network (GDSN) reached its (1983) who analyzed 201 events that occurred full strength could be extended back in time. The during the year 1981. Beginning with the year experience of recent years has shown that mod- 1982 these solutions have been published in erate size earthquakes (M 5 < 6.5) carry much im- Physics of the Earth and Planetary Interiors; the portant seismo-tectonic information and that mb most recent report is for the first quarter of 1987 is not a reliable measure of the size of events. (Dziewonski et al., 1987a). In addition, events of We decided to begin with the earliest time particular interest were reported for earlier years, period, as the integrity of the oldest GDSN net- beginning with 1977. Giardini (1984) analyzed 200 work day-tapes is most likely to deteriorate first. intermediate depth and deep earthquakes with The reports for 1977, 1978 and 1979 have already mb 5.5 for the years 1977—1980. Giardini et al. been published (Dziewonski et al., 1987b,c,d). This (1984) presented solutions for 35 events that oc- report contains data for 515 events; 415 of these curred in the Mediterranean region; Giardim et at. are new solutions; 100 have been published (1985) analyzed 113 earthquakes with magnitude elsewhere but it seemed worthwhile to collect all M~ 6.5 for the years 1977—1980; Ekström and available solutions in a single report. Dziewonski (1985) reported CMT solutions for 35 The principle of the CMT approach is pre- earthquakes in western North America (1977— sented in detail by Dziewonski et a!. (1981). Later 1983) and Ekström (1987) extracted data for 152 enhancements include incorporation of mantle earthquakes in Central Asia and China (1977— wave data in the analysis (Dziewonski and 1986). Woodhouse, 1983) and corrections for lateral het- These regional studies revealed that reliable erogeneity (Woodhouse and Dziewonski, 1984). CMT solutions may be obtained with a very sparse An abbreviated account of the relevant procedures 0031-9201/88/$03.50 © 1988 Elsevier Science Publishers B.V.

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Page 1: Global seismicity of 1980: centroid-moment tensor solutions~ for 515

Physicsof theEarth andPlanetaiy Interiors, 50 (1988)127—154 127ElsevierSciencePublishersBy., Amsterdam— Printedin The Netherlands

Globalseismicityof 1980: centroid-momenttensorsolutions~for 515 earthquakes

A.M. Dziewonski,G. Ekström,J.E.FranzenandJ. H. Woodhouse

Departmentof Earthand PlanetarySciences,HoffmanLaboratory,Harvard University, Cambridge,MA 02138(U.S.A.)

(ReceivedandacceptedJuly1, 1987)

Dziewonski, A.M., Ekstrom, G., Franzen,J. E. andWoodhouse,J.H., 1988. Global seismicityof 1980: centroid-mo-ment tensorsolutionsfor 515 earthquakes.Phys.EarthPlanet. Inter., 50:127—154.

Centroid-momenttensorsolutionsarepresentedfor 515 earthquakesthat occurredduring1980.

Theadventof digital seismometrymadeit pos- network; in the beginningof 1977 therewereonlysible to study the global-spatio-temporalpattern five operational SRO/ASROstations. Actually,of stressreleasein a systematicanduniform way. underusualcircumstancesit is possibleto obtainThe first experiment consistingof determining satisfactory answers with only one stationcentroid-moment tensor (CMT) solutions for (Ekstrom et al., 1986). It becameclear that theearthquakeswith magnitudegreaterthan or equal systematicanalysisthat we beganafterthe Globalto 5.5wasreportedby DziewonskiandWoodhouse Digital SeismographNetwork(GDSN) reachedits(1983) who analyzed 201 events that occurred full strengthcould be extendedbackin time. Theduring the year 1981. Beginning with the year experienceof recentyearshas shown that mod-1982 these solutions have been published in eratesize earthquakes(M5 < 6.5) carry much im-Physics of the Earth and PlanetaryInteriors; the portant seismo-tectonicinformation and that mbmost recentreportis for the first quarterof 1987 is not areliablemeasureof the sizeof events.(Dziewonski et al., 1987a). In addition, events of We decided to begin with the earliest timeparticular interestwere reportedfor earlieryears, period, as the integrity of the oldestGDSN net-beginningwith 1977.Giardini (1984)analyzed200 work day-tapesis most likely to deterioratefirst.intermediatedepth and deep earthquakeswith Thereportsfor 1977, 1978 and1979 havealreadymb� 5.5 for the years1977—1980.Giardini et al. beenpublished(Dziewonskiet al., 1987b,c,d).This(1984)presentedsolutions for 35 eventsthat oc- reportcontainsdatafor 515 events;415 of thesecurredin theMediterraneanregion; Giardimet at. are new solutions; 100 have been published(1985) analyzed113 earthquakeswith magnitude elsewherebut it seemedworthwhile to collect allM~� 6.5 for the years 1977—1980;Ekströmand availablesolutionsin a singlereport.Dziewonski(1985)reportedCMT solutionsfor 35 The principle of the CMT approachis pre-earthquakesin western North America (1977— sentedin detail by Dziewonskiet a!. (1981). Later1983) and Ekström(1987) extracteddata for 152 enhancementsinclude incorporation of mantleearthquakesin Central Asia and China (1977— wave data in the analysis (Dziewonski and1986). Woodhouse,1983) and correctionsfor lateralhet-

These regional studies revealed that reliable erogeneity (Woodhouseand Dziewonski, 1984).CMT solutionsmaybeobtainedwith a verysparse An abbreviatedaccountof therelevantprocedures

0031-9201/88/$03.50 © 1988 Elsevier SciencePublishersB.V.

Page 2: Global seismicity of 1980: centroid-moment tensor solutions~ for 515

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145

~

~ ~ ~

~.•

~

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-

Fig. 1. Equal areaprojectionof the geometricalrepresentationof themoment tensorsolution of the earthquakeslisted in Table I.Solidlines aretheprojectionsof thenodalsurfacesfor thefull moment tensorsolution; broken lines col-respondto thenodalplanesof the‘bestdoublecouple’. The compressionand tensionaxesareindicatedby a plus andby a cross,respectively.

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~ - -~ ~ -

— -

99 100 101 102 103 104 105

106 107 108 109 110 111 112

113 114 115 116 117 118 119

120 121 122 123 124 125 126

127 128 129 130 131 132 133

134 135 136 137 138 139 140

Fig, 1. Continued.

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147

141 142 143 144 145 146 147

148 149 150 151 152 153 154

155 156 157 158 159 160 161

162 163 164 165 166 167 168

169 170 171 172 173 174 175

176 177 178 179 180 181 182

183 184 185 186 187 188 189

190 191 192 193 194 195 196

197 198 199 200 201 202 203

204 205 206 207 208 209 210

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148

211 212 213 214 215 216 217

218 219 220 221 222 223 224

225 226 227 228 229 230 231

232 233 234 235 236 237 238

239 240 241 242 243 244 245

246 247 248 249 250 251 252

253 254 255 256 257 258 259

260 261 262 263 264 265 266

267 268 269 270 271 272 273

274 275 276 277 278 279 280

Fig. 1, Continued,

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149

281 282 283 284 285 286 287

288 289 290 291 292 293 294

295 296 297 298 299 300 301

302 303 304 305 306 307 308

309 310 311 312 313 314 315

316 317 318 319 320 321 322

323 324 325 326 327 328 329

330 331 332 333 334 335 336

337 338 339 340 341 342 343

344 345 346 347 348 349 350

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150

351 352 353 354 355 356 357

358 359 360 361 362 363 364

365 366 367 368 369 370 371

372 373 374 375 376 377 378

379 380 381 382 383 384 385

386 387 388 389 390 391 392

393 394 395 396 397 398 399

400 401 402 403 404 405 406

407 408 409 410 411 412 413

414 415 416 417 418 419 420

Fig, 1. Continued.

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421 422 423 424 425 426 427

428 429 430 431 432 433 434

435 436 437 438 439 440 441

442 443 444 445 446 447 448

449 450 451 452 453 454 455

456 457 458 459 460 461 462

463 464 465 466 467 468 469

470 471 472 473 474 475 476

477 478 479 480 481 482 483

484 485 486 487 488 489 490

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491 492 493 494 495 496 497

498 499 500 501 502 503 504

505 506 507 508 509 510 511

512 513 514 515

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~ - — —.0 515

-~- I I I I I I88184

491269

3~7 241 ~

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I I I I I I

Fig, 2a, Distribution andsourcemechanismsolutionsfor the largest(M~� 6.5) eventswith a focal depth� 50 km; the sizeof abeach-ballis a linear function of magnitude; thenumberscorrespondto eventnumbersin TablesI andII.

I I 1 1 4

267

256

a 286 /131 5

411-/

d 208

(b)I I I I I I I

Fig. 2b, Sameast-ig. 2a but for eventsatdepths50 km.

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154

can be found in Dziewonski et a!. (1983, 1984) Dziewonski, AM,, Franzen,J,E, and Woodhouse,J,H., 1984,The results of CMT analysis are presentedin Centroid-momenttensorsolutionsforJanuary—March1984,

TablesI andII. Explanationandcommentson the Phys.Earth Planet, Inter,, 34: 209—219,Dziewonski,AM., Ekstrbm,G., Franzen,J.E. andWoodhouse,

table entries can be found in Dziewonskiet al.J.H., 1987a. Centroid-moment tensor solutions for

(1987e). Figure 1 shows a graphicrepresentation January—March 1987. Phys. Earth Planet, Inter,,

of the moment tensor solutions for all events. 50:116—126.

Mapsin Figs.2a and2b show sourcemechanisms Dziewonski,A,M,, Ekström,G,, Franzen,J.E. andWoodhouse,

for eventswith M~� 6.5 for shallow (h � 50 km) J.H., 1987b. Global seismicity of 1977; centroid-momenttensorsolutionsfor 471 earthquakes.Phys. Earth Planet,

andintermediateanddeepearthquakes. Inter,, 45: 11—36.

Dziewonski,A,M., Ekström,G., Franzen,J.E.andWoodhouse,J,H., 1987c, Global seismicity of 1978; centroid-moment

Acknowledgments tensorsolutionsfor 512 earthquakes.Phys. Earth Planet.Inter., 46: 316—342.

The analysis describedhere was performed Dziewonski,A.M., Ekstrom,G., Franzen,J.E.andWoodhouse,

usingdatafrom the Global Digital Seismographic J.H., 1987d. Global seismicity of 1979; centroid-momenttensorsolutions for 524 earthquakes.Phys. Earth Planet.Network operatedby the Albuquerque Seismo- Inter., 48: 18—46.

logical Laboratoryof the U.S.GeologicalSurvey. Dziewonski,AM., Ekstrom,G.,Franzen,J.E. andWoodhouse,

The GDSN tapeswere kindly lent to us by the J.H., 1987e. Centroid-moment tensor solutions forEarthResourcesLaboratoryof MIT. Someof the January—March1986. Phys.Earth Planet. Inter., 45: 1—10.

solutionspublishedby Giardini et al. (1985) and Ekström, G. and Dziewonski, AM., 1985. Centroid-momenttensor solutions for 35 earthquakesin western Northincluded in this report were obtainedusingalso America(1977—1983).Bull. Seismol.Soc, Am,, 75: 23—39.

datafrom the IDA networkoperatedby the Uni- Ekström, G,, Dziewonski, AM. and Steim, J.M., 1985. Single

versityof California, SanDiego.This researchhas stationCMT: applicationto theMichoacan,Mexico earth-

beensupportedby the grant EAR85-20549from quake of September19, 1985. Geophys.Res. Lett., 13:

the NationalScienceFoundation. 173-176.Ekström,G,, 1987. A broadbandmethodof earthquakeanaly-sis. Ph.D. Thesis,Harvard University,Cambridge,216 pp.

Giardini, D., 1984. Systematicanalysisof deep seismicity:200

References centroid-momenttensorsolutions for earthquakesbetween1977 and1980. Geophys.J.R.Astron.Soc., 77: 883—914.

Giardini, D., Dziewonski, AM,, Woodhouse,J.H. andBoschi,

Dziewonski, A.M. andWoodhouse,J.H., 1983. An experiment E., 1985. Systematicanalysisof the Mediterraneanregionin the systematicstudyof global seismicity: centroid-mo- using the Centroid-MomentTensormethod. In: A. Bram-ment tensOr solutions for 201 moderateand largeearth- bati andD. Slejko. (Editor), TheO.G.S.Silver Anniversaryquakesof 1981. J. Geophys,Res,,88: 3247—3271. Volume. O.G.S.,Trieste,pp. 121—124.

Dziewonski, A.M., Chou, T.-A. and Woodhouse,J.H., 1981. Giardini, D., Dziewonski, A.M. and Woodhouse,J.H., 1985.Determination of earthquake source parameters from Centroid-moment tensor solutions for 113 large earth-waveformdatafor studiesof global andregionalseismicity. quakes in 1977—1980. Phys. Earth Planet. Inter, 40:J. Geophys.Res,,86: 2825—2852. 259—272.

Dziewonski,AM., Friedman,A., Giardini, D. andWoodhouse, Woodhouse,J.H. and Dziewonski, A.M., 1984. Mapping theJ.H., 1983. Global seismicity of 1982: centroid-moment uppermantle: threedimensionalmodellingof Earth struc-tensorsolutionsfor 308 earthquakes.Phys. Earth Planet. tureby inversionof seismicwaveforms,J. Geophys.Res.,Inter., 33: 76—90. 89: 5953—5986.