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1965 Valparaíso earthquake and the El Cobre dam failures

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31: 640:, the most severe of which affected the town of El Cobre, killing hundreds of residents and workers. Tailing dams failing because of seismic activities were a known risk to surrounding communities, as seen in previous events. Many of these incidents were a result of liquefaction with flow failure, slope instability and quake-related deformations or overtopping. Similar instances of sand tailing dams failing were also observed during earthquakes in 1981, 1985, 1997, and 2010. 38: 426:
are sparse due to the poor instrumentation at the time. Few moderately-sized events were recorded. Local seismic stations managed to record approximately five aftershocks each day. Intraslab earthquakes are common in the region as the subducting plate flexes and deform. The largest intermediate-depth
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which oversees natural disasters and rescue efforts in Chile. Prior to the disaster, there had not been any formal organization to coordinate any rescue and recovery efforts, mainly because local officials and residents have endured many of the frequent earthquakes in the area.
415:  7.4 mainshock nucleated about 72 kilometers (45 miles) beneath the community of La Ligua. The focal mechanism of this earthquake suggests normal faulting within the slab of the Nazca Plate rather than on the subduction zone interface of the megathrust. The 463:
At the time it had struck, many Chileans had just finished preparing their lunch means or returned from church services. This may have reduced the anticipated death toll because many churches had collapsed from ground motions, and there were very few instances of
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buildings. Over 21,000 houses collapsed and 70,000 had to be repaired. Houses made of hollow concrete units were especially severely affected, cracks appeared due to the lack of bonding between bricks and the concrete fillings, shear failure, and damage to beams.
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of the March 28 quake, although both events were on separate fault planes. The foreshock had a thrust mechanism, different from the mechanism of the mainshock. It occurred much shallower and based on the focal mechanism analyzed, was interpreted as an
316: ) 7.4–7.6 earthquake killed 400–500 people and inflicted US$ 1 billion (adjusted for inflation) in damage. Many deaths were from El Cobre, a mining location that was wiped out after a series of dam failures caused by the earthquake spilled 685:
was called in for aid to mobilize the arrival of tents and makeshift kitchens to those who had lost their homes. Government officials and military chiefs were also involved in the distribution of food, water, and medical aid.
486:, the shock knocked out electricity and stirred panic in many neighborhoods. Four persons died from the temblor, including a woman who fell to her death after jumping off the second floor of a hospital and another during a 702:
The dam failures marked a series of changes to the civil engineering and mining community, and the design of tailing dams. Upstream tailing dams were opted for other means such as downstream tailings dams, rock-fills, and
476:, over 100,000 people were left homeless. The Department of Illapel reported more than 90% of homes had been damaged, and a hospital was completely destroyed, adding that "only facades of the houses remain standing". 652:
released 350,000 and 1,900,000 cubic meters (12,000,000 and 67,000,000 cubic feet) cubic meters of debris respectively, and traveled 12 kilometers (7.5 miles) downstream which destroyed the town of El Cobre, in
30: 154: 1044: 877: 681:. The Ministers of Public Works and Defence were taken to the affected town of Llay-Llay to survey the damage extent and plan the rescue and recovery efforts. The 1255: 565: 1685: 1548: 983: 1660: 975: 661:. Many of the casualties were miners and peasants who were mining for copper. The official death toll is at 247, but is thought to be as high as 350–400. 404:
on the plate boundary. Whether the 22 March quake was a true foreshock or the seven day time separation was sheer coincidence may never be determined.
746: 1059: 1665: 1179:"Design, construction, operation and the effect of fines content and permeability on the seismic performance of tailings sand dams in Chile" 1227: 1675: 371:
on the interface of the plate boundary megathrust. Thrusting during large earthquakes cause significant uplift of the seafloor, causing
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onto the area, burying hundreds of residents. The shock was felt throughout the country and along the
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Espinace, Raúl; Valenzuela, Pamela; Villavicencio, Gabriel; Palma, Juan; Fourie, Andy (April 2014).
1060:"El Día reported on the strong earthquake on March 29, 1965 leaving extensive damage and fatalities" 926: 674: 416: 337: 336:, where many of the world's active volcanoes and seismic activities are concentrated at. Off the 81: 694:
This tragedy, along with the 1960 earthquakes, was one of the reasons for the formation of the
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collapsed, while ten were injured. An estimated 2,000 homes were badly damaged in the capital.
670: 506: 1223: 68: 1099: 1000: 951: 859: 654: 469: 384: 309: 927:"Thrust and extensional faulting under the Chilean coast: 1965, 1971 Aconcagua earthquakes" 189: 518: 996: 947: 855: 956: 813: 649: 321: 1644: 1085: 510: 479: 465: 107: 375:. In some occasions, earthquakes occur within the downgoing tectonic plate instead. 682: 637: 633: 368: 333: 1178: 863: 658: 618:
Tailings from the failures travelled downstream and buried the town of El Cobre.
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reported 25 deaths and 40% of its buildings damaged from the earthquake. At
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On 22 March 1965, a magnitude 6.2–6.4 earthquake rocked the coastal town of
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Leytona, Felipe; Ruizb, Javier; Camposa, Jaime; Kausel, Edgar (June 2009).
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at a depth of 48.8 kilometers (30.3 miles), slightly north of the
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Earthquakes are frequent in Chile, which lies in the so-called
838:"Historical and Recent Large Megathrust Earthquakes in Chile" 1086:"Failures of sand tailings dams in a highly seismic country" 359:. Active subduction produce large earthquakes including the 419:
within the slab occurred on a near-vertical normal fault.
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Chile Hit By Devastating Earthquake 1965 HD Stock Footage
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The maximum intensity of the earthquake was assigned IX (
1219: 501:, where four people had died, two each in La Laguna and 1118:"Chronology of major tailings dam failures (from 1960)" 1208:
Tragic Chilean Earthquake Aftermath At El Cobre (1965)
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National Office of Emergency of the Interior Ministry
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indicates earthquake resulting in at least 30 deaths
1024:"CONFINED MASONRY BUILDINGS: THE CHILEAN EXPERIENCE" 925:
Malgrange, M.; Deschamps, A.; Madariaga, R. (1981).
1453: 1362: 1271: 622: 614: 606: 596: 557: 549: 534: 274: 266: 250: 242: 234: 213: 205: 195: 185: 148: 140: 118: 102: 87: 74: 61: 50: 636:from the earthquake resulted in the failure of 17 304:, about 140 km (87 mi) from the capital 809:"Earthquake Toll Heavy in Chile; Village Buried" 836:Ruiz, Madariaga, Sergio, Raúl (February 2018). 772:"Factbox: Chile has history of big earthquakes" 1633:indicates the deadliest earthquake of the year 1542: 1249: 1186:Obras y proyectos revista de ingeniería civil 451:. The earthquake inflicted serious damage to 308:on Sunday, March 28 at 12:33 local time. The 8: 1043:: CS1 maint: multiple names: authors list ( 1022:M. Astroza, F. Andrade, M.O. Moroni (2017). 984:Physics of the Earth and Planetary Interiors 876:: CS1 maint: multiple names: authors list ( 529: 490:to race for the exit at a racetrack after a 19: 817:. Vol. 38, no. 202. 29 March 1965 1549: 1535: 1527: 1256: 1242: 1234: 528: 427:intraslab earthquake in the region was a M 18: 969: 967: 955: 255: 124: 367:. These earthquakes are associated with 363:which had a magnitude of 9.5–9.6 on the 747:"Significant Earthquake CHILE: CENTRAL" 738: 497:Additional casualties were reported at 16:Earthquake and mining disaster in Chile 1036: 869: 1206:Archived footage from British Pathé: 1177:Valenzuela, Luis (15 December 2015). 1141: 1139: 669:In the immediate hours of the quake, 517:and Ventanas. Three deaths were from 7: 1686:20th-century floods in South America 920: 918: 916: 914: 803: 801: 799: 797: 795: 1031:16th World Conference on Earthquake 521:when a wall fell on those victims. 1661:March 1965 events in South America 1220:International Seismological Centre 1212:Archived footage with commentary: 957:10.1111/j.1365-246X.1981.tb05958.x 892:"M 6.2 - offshore Coquimbo, Chile" 530:1965 Central Chile mining disaster 14: 935:Geophysical Journal International 449:Modified Mercalli intensity scale 36: 29: 395:. It has been interpreted as a 214: 1: 1666:Dam failures in South America 1091:Canadian Geotechnical Journal 727:List of tailings dam failures 717:List of earthquakes in Chile 707:, despite the higher costs. 864:10.1016/j.tecto.2018.01.015 722:List of earthquakes in 1965 209:US$ 125 million (1965 rate) 1722: 1676:Natural disasters in Chile 1005:10.1016/j.pepi.2008.03.017 648:Two dams belonging to the 286:1965 Valparaíso earthquake 20:1965 Valparaíso earthquake 1681:Mining disasters in Chile 1623: 1570: 610:Earthquake + Liquefaction 357:convergent plate boundary 24: 361:1960 Valdivia earthquake 91:March 28, 1965 1696:1965 disasters in Chile 1058:admin (29 March 2014). 1009:Elsevier Science Direct 538:28 March 1965 433:8.0 beneath Antofagasta 1156:University of Delaware 365:moment magnitude scale 1706:1965 mining disasters 1701:Tailings dam failures 1395:1949 Tierra del Fuego 1104:10.1139/cgj-2013-0142 679:Eduardo Frei Montalva 525:Chile mining disaster 402:interplate earthquake 353:Peru–Chile Megathrust 1651:Earthquakes in Chile 1265:Earthquakes in Chile 1122:WISE Uranium Project 897:US Geological Survey 644:El Cobre dam failure 601:Tailings dam failure 349:South American Plate 324:coast of Argentina. 1561:Earthquakes in 1965 997:2009PEPI..175...37L 948:1981GeoJ...66..313M 856:2018Tectp.733...37R 577: /  531: 290:La Ligua earthquake 288:(also known as the 190:Normal (Intraplate) 166: /  57:1965-03-28 16:33:16 21: 1228:authoritative data 675:President of Chile 505:, and one each in 417:earthquake rupture 1638: 1637: 1524: 1523: 1486:2012 Constitución 1146:Kennedy, Will C. 671:cabinet ministers 630: 629: 581:32.639°S 71.162°W 455:and unreinforced 298:Valparaíso Region 282: 281: 170:32.522°S 71.233°W 1713: 1656:1965 earthquakes 1551: 1544: 1537: 1528: 1466:2007 Aysén Fjord 1440:1995 Antofagasta 1258: 1251: 1244: 1235: 1194: 1193: 1183: 1174: 1168: 1167: 1165: 1163: 1152: 1143: 1134: 1133: 1131: 1129: 1114: 1108: 1107: 1081: 1075: 1074: 1072: 1070: 1055: 1049: 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1450: 1448: 1447: 1445:1997 Punitaqui 1442: 1437: 1432: 1430:1985 Algarrobo 1427: 1425:1971 Aconcagua 1422: 1417: 1412: 1407: 1402: 1397: 1392: 1387: 1382: 1377: 1372: 1366: 1364: 1360: 1359: 1357: 1356: 1351: 1346: 1341: 1336: 1331: 1326: 1321: 1316: 1311: 1306: 1301: 1296: 1291: 1286: 1281: 1275: 1273: 1269: 1268: 1263: 1261: 1260: 1253: 1246: 1238: 1232: 1231: 1216: 1210: 1202: 1201:External links 1199: 1196: 1195: 1169: 1135: 1109: 1098:(4): 449–464. 1076: 1050: 1014: 991:(1–2): 37–46. 963: 942:(2): 313–331. 910: 883: 843:Tectonophysics 828: 814:The Desert Sun 791: 763: 737: 736: 734: 731: 730: 729: 724: 719: 712: 709: 691: 688: 666: 663: 645: 642: 628: 627: 624: 620: 619: 616: 612: 611: 608: 604: 603: 598: 594: 593: 561: 555: 554: 551: 547: 546: 536: 526: 523: 466:conflagrations 440: 437: 428: 412: 408: 380: 377: 338:coast of Chile 329: 326: 313: 292:) struck near 280: 279: 276: 272: 271: 268: 264: 263: 257: 252: 248: 247: 244: 240: 239: 236: 232: 231: 218: 211: 210: 207: 203: 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Retrieved 750: 741: 701: 693: 683:Chilean Army 668: 647: 638:tailing dams 634:liquefaction 631: 519:Viña del Mar 496: 478: 462: 444: 442: 421: 406: 382: 347:beneath the 334:Ring of Fire 331: 289: 285: 283: 278:400–500 dead 224: 206:Total damage 1599:Puget Sound 1584:Rat Islands 1506:2016 Chiloé 1400:1950 Calama 1390:1943 Ovalle 659:debris flow 584: / 559:Coordinates 424:aftershocks 422:Records of 342:Nazca Plate 267:Aftershocks 173: / 65: event 1645:Categories 1590:Valparaiso 1476:2010 Chile 1380:1928 Talca 1349:1868 Arica 1299:1615 Arica 1294:1604 Arica 1272:Historical 733:References 705:earth dams 572:71°09′43″W 569:32°38′20″S 542:1965-03-28 507:San Felipe 492:grandstand 480:Valparaíso 379:Earthquake 351:along the 275:Casualties 251:Foreshocks 243:Landslides 161:71°13′59″W 158:32°31′19″S 95:1965-03-28 54: time 1575:Ceram Sea 850:: 37–56. 665:Aftermath 655:La Calera 513:, Melon, 499:Llay-Llay 470:Salamanca 447:) on the 397:foreshock 393:mainshock 389:epicenter 385:Los Vilos 217:intensity 149:Epicenter 119:Magnitude 112:UTC-03:00 106:12:33 pm 711:See also 550:Location 488:stampede 484:Santiago 431:  373:tsunamis 345:subducts 322:Atlantic 306:Santiago 294:La Ligua 262:6.2–6.4 223:MMI IX ( 122:7.4–7.6 1226:and/or 1192:: 6–22. 993:Bibcode 944:Bibcode 852:Bibcode 777:Reuters 632:Severe 626:350–400 615:Outcome 540: ( 503:Quilpué 474:Illapel 457:masonry 445:Violent 391:of the 235:Tsunami 225:Violent 144:70.0 km 136:  93: ( 1614:Oaxaca 1222:has a 1064:El Día 690:Legacy 623:Deaths 511:Colina 439:Impact 340:, the 82:ComCat 69:858940 1182:(PDF) 1162:6 Dec 1151:(PDF) 1128:6 Dec 1069:6 Dec 1027:(PDF) 979:(PDF) 930:(PDF) 903:6 Dec 821:5 Dec 784:6 Dec 756:6 Dec 607:Cause 553:Chile 515:Olmué 468:. In 453:adobe 407:The M 302:Chile 200:Chile 141:Depth 132:7.5 M 75:USGS- 1218:The 1164:2020 1130:2020 1071:2020 1045:link 905:2020 878:link 823:2020 786:2020 758:2020 751:NGCD 597:Type 535:Date 472:and 355:; a 284:The 270:Yes 238:None 215:Max. 186:Type 108:CLST 77:ANSS 1100:doi 1001:doi 989:175 952:doi 860:doi 848:733 296:in 246:Yes 63:ISC 52:UTC 1647:: 1594:‡† 1190:19 1188:. 1184:. 1153:. 1138:^ 1120:. 1096:51 1094:. 1088:. 1062:. 1041:}} 1037:{{ 1029:. 999:. 987:. 981:. 966:^ 950:. 940:66 938:. 932:. 913:^ 894:. 874:}} 870:{{ 858:. 846:. 840:. 811:. 794:^ 774:. 749:. 677:, 509:, 435:. 312:(M 300:, 1631:‡ 1626:† 1609:† 1579:† 1564:→ 1558:← 1550:e 1543:t 1536:v 1257:e 1250:t 1243:v 1166:. 1132:. 1106:. 1102:: 1073:. 1047:) 1033:. 1011:. 1003:: 995:: 960:. 954:: 946:: 907:. 880:) 866:. 862:: 854:: 825:. 788:. 760:. 544:) 429:w 413:w 409:s 314:w 258:w 256:M 227:) 134:s 127:w 125:M 114:) 110:( 97:)

Index

1965 Valparaíso earthquake and the El Cobre dam failures is located in South America
UTC
ISC
858940
ANSS
ComCat
CLST
UTC-03:00
Mw
32°31′19″S 71°13′59″W / 32.522°S 71.233°W / -32.522; -71.233
Normal (Intraplate)
Chile
MMI IX (Violent)
Mw
La Ligua
Valparaíso Region
Chile
Santiago
moment magnitude
mineral waste
Atlantic
Ring of Fire
coast of Chile
Nazca Plate
subducts
South American Plate
Peru–Chile Megathrust
convergent plate boundary
1960 Valdivia earthquake
moment magnitude scale

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