27:
282:. The area is seismically very active with large thrust type earthquakes occurring along the plate interface and normal fault type earthquakes occurring at a somewhat deeper level within the descending slab. The plate interface seismicity in this area is strongly segmented, with separate Jalisco, Michoacán, Guerrero and Colima segments being recognised. The southeastern end of the Michoacan segment coincides with the broad Orozco
34:
318:. The maximum slip of this earthquake was estimated to be about 4.04 m. According to the calculation of C. Mendoza, along the dipping interface the area of maximum slip was concentrated below the hypocenter, and there was another area of significant slip, of about 1 metre (3.3 ft), above the hypocenter.
326:
Michoacan suffered widespread damage with some buildings also affected in Mexico City. There were 2 deaths and 17 people injured in
Michoacán and 1 death and 11 people injured in Mexico City. One source reports a total of 9 deaths associated with this earthquake.
645:
306:
broke the two remaining parts of the
Michoacán gap, i.e. those to the north and south of the 1981 Playa Azul earthquake rupture zone. The 1981 Playa Azul earthquake had a
980:
845:
391:
717:
26:
530:
747:
1286:
1215:
1205:
817:
973:
286:
within the Cocos Plate. During the 1970s, with no major earthquakes recorded since at least 1911, the segment was recognised as a major
1149:
649:
57:
768:
1291:
838:
185:
330:
Power outages and telephone service interruptions were widespread in Mexico City. Thousands of people got stuck in darkness in the
1049:
889:
743:
71:
1190:
1124:
673:"Possible lateral stress interactions in a sequence of large interplate earthquakes on the subducting Cocos and Rivera Plates"
138:
1271:
966:
587:
1089:
1018:
989:
348:
1245:
1034:
1003:
922:
831:
1139:
895:
860:
857:
854:
470:
421:
343:
303:
1164:
1119:
871:
680:
46:
1266:
1074:
1008:
213:
1240:
1210:
1200:
1195:
1154:
1109:
1094:
1084:
1064:
1039:
234:
225:
113:
103:
721:
1281:
1276:
1220:
1144:
1069:
1044:
1235:
1230:
1225:
1185:
1180:
1159:
1129:
1114:
1104:
1099:
1079:
1059:
1054:
1013:
901:
910:
299:
279:
379:. Vol. 81A. International Association of Seismology and Physics of Earth's Interiors. p. 684.
561:
422:"Shape of the subducted Rivera and Cocos plates in southern Mexico: Seismic and tectonic implications"
880:
545:
485:
436:
275:
246:. Some buildings were damaged in both Michoacán and Mexico City. A small tsunami was registered in
259:
793:
501:
212:
occurred on
October 24, 1981, at 21:22 local time (03:22 UTC on October 25). It was located near
531:"Tectonic setting and source parameters of the September 19, 1985 Michoacan, Mexican Earthquake"
76:
331:
813:
369:
63:
689:
553:
493:
444:
694:
311:
307:
271:
614:
549:
489:
440:
1260:
283:
505:
315:
263:
217:
471:"Overview of Recent Coastal Tectonic Deformation in the Mexican Subduction Zone"
287:
267:
243:
672:
497:
153:
140:
557:
823:
613:
Havskov, J.; Singh S.K.; Nava E.; Dominguez T. & Rodriguez M. (1983).
469:
Ramírez-Herrera, M.T.; Kostoglodov V. & Urrutia-Fucugauchi J. (2011).
615:"Playa Azul, Michoacán, Mexico, earthquake of 25 October 1981 (Ms = 7.3)"
247:
958:
448:
221:
302:
that occurred in the central part of the
Michoacán seismic gap. The
377:
International
Handbook of Earthquake Engineering Seismology, Part A
242:
7.3. Three deaths were reported, two from
Michoacán and one from
375:. In Lee W.H.K.; Kanamori H.; Jennings P.; Kissinger K. (eds.).
962:
827:
794:
http://digaohm.semar.gob.mx/imagenes/CAT/Historia_tsunamis.pdf
401:. World data Center A for Solid Earth Geophsics. p. 36
809:
769:"Earthquake Hits Mexico City; Power Outages Widespread"
946:
indicates earthquake resulting in at least 30 deaths
392:"Catalog of Tsunamis on the Western Coast of Mexico"
1173:
1027:
996:
716:United States Geological Survey (January 5, 2010).
648:(in Spanish). Centro de Geociencias. Archived from
198:
177:
169:
132:
124:
98:
90:
82:
69:
56:
45:
671:Santoyo, M.A.; Mikumo T. & Mendoza C. (2007).
33:
390:Sanchez Devora, A.J.; Farreras Sanz S.F. (1993).
619:Bulletin of the Seismological Society of America
529:Eissler, H.; Astiz L. & Kanamori H. (1986).
258:The southwestern coast of Mexico lies above the
951:indicates the deadliest earthquake of the year
974:
839:
8:
16:
718:"Significant Earthquakes of the World 1981"
981:
967:
959:
846:
832:
824:
15:
693:
524:
522:
235:
226:
114:
104:
360:
224:. The magnitude of the earthquake was
695:10.22201/igeof.00167169p.2007.46.4.50
368:Engdahl, E.R.; Villaseñor A. (2002).
7:
250:with a maximum height of 9 cm.
775:. Associated Press. October 5, 1981
810:International Seismological Centre
14:
744:National Geophysical Data Center
32:
25:
429:Journal of Geophysical Research
178:
370:"Global seismicity: 1900–1999"
1:
1287:October 1981 events in Mexico
420:Pardo, M.; Suárez G. (1995).
349:List of earthquakes in Mexico
538:Geophysical Research Letters
478:Pure and Applied Geophysics
344:List of earthquakes in 1981
1308:
210:1981 Playa Azul earthquake
17:1981 Playa Azul earthquake
941:
867:
498:10.1007/s00024-010-0205-y
304:1985 Michoacán earthquake
21:
1292:1981 disasters in Mexico
748:"Significant Earthquake"
588:"Terremotos: Predicción"
681:Geofísica Internacional
558:10.1029/gl013i006p00569
314:from a shallow-dipping
298:This earthquake was an
202:3–9 killed, 28 injured
1272:Earthquakes in Mexico
1216:2014 Mexico–Guatemala
990:Earthquakes in Mexico
592:La Ciencia para todos
300:interplate earthquake
280:Middle America Trench
1206:2012 Guerrero–Oaxaca
1191:2010 Baja California
1125:1979 Imperial Valley
276:North American Plate
1150:1995 Colima–Jalisco
858:Earthquakes in 1981
652:on 15 December 2013
550:1986GeoRL..13..569E
490:2011PApGe.168.1415R
441:1995JGR...10012357P
435:(B7): 12357–12373.
260:convergent boundary
150: /
52:1981-10-25 03:22:15
18:
1090:1959 Coatzacoalcos
1019:1892 Laguna Salada
818:authoritative data
773:The New York Times
724:on 11 October 2012
484:(8–9): 1415–1433.
1254:
1253:
1004:1475 Tenochtitlan
956:
955:
646:"Playa Azul Slip"
449:10.1029/95jb00919
332:Mexico City Metro
206:
205:
1299:
1267:1981 earthquakes
1140:1985 Mexico City
983:
976:
969:
960:
848:
841:
834:
825:
796:
791:
785:
784:
782:
780:
765:
759:
758:
756:
754:
740:
734:
733:
731:
729:
720:. Archived from
713:
707:
706:
704:
702:
697:
677:
668:
662:
661:
659:
657:
641:
635:
634:
632:
630:
610:
604:
603:
601:
599:
583:
577:
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574:
572:
566:
560:. Archived from
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526:
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475:
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460:
459:
457:
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426:
417:
411:
410:
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365:
312:reverse faulting
254:Tectonic setting
240:
231:
194:
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180:
165:
164:
162:
161:
160:
155:
154:18.05°N 102.08°W
151:
148:
147:
146:
143:
119:
109:
86:October 24, 1981
36:
35:
29:
19:
1307:
1306:
1302:
1301:
1300:
1298:
1297:
1296:
1257:
1256:
1255:
1250:
1169:
1135:1981 Playa Azul
1023:
992:
987:
957:
952:
947:
937:
904:(6.6, June 11)
898:(5.9, April 26)
890:Gulf of Corinth
863:
852:
820:for this event.
805:
800:
799:
792:
788:
778:
776:
767:
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750:
742:
741:
737:
727:
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715:
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698:
675:
670:
669:
665:
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628:
626:
612:
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607:
597:
595:
585:
584:
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570:
568:
564:
533:
528:
527:
520:
510:
508:
473:
468:
467:
463:
453:
451:
424:
419:
418:
414:
404:
402:
394:
389:
388:
384:
372:
367:
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357:
340:
324:
308:focal mechanism
296:
256:
239:
230:
186:
184:
158:
156:
152:
149:
144:
141:
139:
137:
136:
118:
111:
108:
91:Local time
83:Local date
41:
40:
39:
38:
37:
12:
11:
5:
1305:
1303:
1295:
1294:
1289:
1284:
1282:1980s tsunamis
1279:
1277:1981 in Mexico
1274:
1269:
1259:
1258:
1252:
1251:
1249:
1248:
1246:2022 Michoacán
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1127:
1122:
1117:
1112:
1107:
1102:
1097:
1092:
1087:
1082:
1077:
1075:1940 El Centro
1072:
1067:
1062:
1057:
1052:
1047:
1042:
1037:
1035:1911 Michoacán
1031:
1029:
1025:
1024:
1022:
1021:
1016:
1011:
1009:1787 New Spain
1006:
1000:
998:
994:
993:
988:
986:
985:
978:
971:
963:
954:
953:
942:
939:
938:
936:
935:
929:
925:(6.1, Sep 12)
920:
913:(7.2, Jul 28)
908:
899:
893:
887:
883:(6.8, Jan 23)
878:
868:
865:
864:
853:
851:
850:
843:
836:
828:
822:
821:
804:
803:External links
801:
798:
797:
786:
760:
735:
708:
688:(4): 211–226.
663:
644:Lopez, M.R.M.
636:
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544:(6): 569–572.
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170:Areas affected
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159:18.05; -102.08
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1241:2021 Guerrero
1239:
1237:
1234:
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1227:
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1222:
1219:
1217:
1214:
1212:
1211:2014 Guerrero
1209:
1207:
1204:
1202:
1201:2011 Zumpango
1199:
1197:
1196:2011 Guerrero
1194:
1192:
1189:
1187:
1184:
1182:
1179:
1178:
1176:
1172:
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1165:1999 Tehuacán
1163:
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1155:1995 Guerrero
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1148:
1146:
1143:
1141:
1138:
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1133:
1131:
1128:
1126:
1123:
1121:
1120:1979 Petatlán
1118:
1116:
1113:
1111:
1110:1973 Veracruz
1108:
1106:
1103:
1101:
1098:
1096:
1095:1964 Guerrero
1093:
1091:
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1086:
1085:1957 Guerrero
1083:
1081:
1078:
1076:
1073:
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1050:1915 Mexicali
1048:
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1041:
1040:1911 Guerrero
1038:
1036:
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1007:
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991:
984:
979:
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965:
964:
961:
950:
945:
940:
934:(7.2, Oct 25)
933:
930:
928:
924:
921:
919:
916:
912:
909:
907:
903:
900:
897:
894:
892:(6.7, Feb 24)
891:
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886:
882:
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874:(6.7, Jan 19)
873:
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869:
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862:
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844:
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830:
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664:
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593:
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582:
579:
567:on 2010-07-23
563:
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284:fracture zone
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73:
68:
65:
62:
59:
55:
51:
48:
44:
28:
20:
1221:2017 Chiapas
1174:21st century
1145:1995 Chiapas
1134:
1070:1937 Orizaba
1065:1932 Jalisco
1045:1912 Acambay
1028:20th century
948:
943:
931:
926:
923:Darel Valley
917:
914:
905:
884:
875:
814:bibliography
789:
777:. Retrieved
772:
763:
751:. Retrieved
738:
726:. Retrieved
722:the original
711:
699:. Retrieved
685:
679:
666:
654:. Retrieved
650:the original
639:
627:. Retrieved
625:(2): 449–457
622:
618:
608:
596:. Retrieved
594:(in Spanish)
591:
581:
569:. Retrieved
562:the original
541:
537:
509:. Retrieved
481:
477:
464:
452:. Retrieved
432:
428:
415:
403:. Retrieved
398:
385:
376:
363:
329:
325:
316:thrust fault
297:
274:beneath the
264:Rivera Plate
257:
209:
207:
188:
1236:2020 Oaxaca
1231:2018 Oaxaca
1226:2017 Puebla
1186:2010 Oaxaca
1181:2003 Colima
1160:1999 Oaxaca
1130:1980 Oaxaca
1115:1978 Oaxaca
1105:1973 Colima
1100:1965 Oaxaca
1080:1941 Colima
1060:1931 Oaxaca
1055:1920 Xalapa
1014:1887 Sonora
896:Westmorland
288:seismic gap
268:Cocos Plate
244:Mexico City
157: /
60: event
1261:Categories
997:Historical
932:Playa Azul
872:Irian Jaya
355:References
294:Earthquake
278:along the
270:are being
262:where the
214:Playa Azul
199:Casualties
187:MMI VIII (
49: time
779:11 August
753:11 August
728:11 August
701:11 August
656:11 August
629:11 August
598:11 August
586:Nava, A.
571:11 August
511:11 August
454:11 August
405:11 August
272:subducted
218:Michoacán
181:intensity
133:Epicenter
99:Magnitude
506:73715203
338:See also
248:Acapulco
233:7.2, or
145:102°05′W
816:and/or
546:Bibcode
486:Bibcode
437:Bibcode
142:18°03′N
902:Golbaf
812:has a
504:
322:Damage
222:Mexico
189:Severe
173:Mexico
77:ComCat
64:610441
911:Sirch
676:(PDF)
565:(PDF)
534:(PDF)
502:S2CID
474:(PDF)
425:(PDF)
399:SE-50
395:(PDF)
373:(PDF)
128:33 km
125:Depth
94:21:22
70:USGS-
881:Dawu
808:The
781:2012
755:2012
730:2012
703:2012
658:2012
631:2012
600:2012
573:2012
513:2012
456:2012
407:2012
266:and
208:The
179:Max.
112:7.3
102:7.2
72:ANSS
690:doi
554:doi
494:doi
482:168
445:doi
433:100
310:of
58:ISC
47:UTC
1263::
771:.
746:.
686:46
684:.
678:.
623:73
621:.
617:.
590:.
552:.
542:13
540:.
536:.
521:^
500:.
492:.
480:.
476:.
443:.
431:.
427:.
397:.
334:.
290:.
220:,
216:,
982:e
975:t
968:v
949:‡
944:†
927:†
918:‡
915:†
906:†
885:†
876:†
861:→
855:←
847:e
840:t
833:v
783:.
757:.
732:.
705:.
692::
660:.
633:.
602:.
575:.
556::
548::
515:.
496::
488::
458:.
447::
439::
409:.
238:s
236:M
229:w
227:M
191:)
117:s
115:M
107:w
105:M
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