Knowledge (XXG)

1993 Klamath Falls earthquakes

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These fault networks have caused several previous earthquakes in the Klamath Falls area. Records from 1945 indicate approximately fifteen seismic events, prior to the 1993 events, circulating within a 10-mile (16 km) radius of Klamath Falls. However, of those observed during the preceding fifty
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The tectonic structure of south-central Oregon is riddled with fault lines. The West Klamath Lake fault zone is capable of earthquakes up to Richter magnitude 7.3. The magnitude 5.4 Coos Bay earthquake which preceded a later 2002 Klamath Falls earthquake occurred along the northern segment of the
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about twelve minutes before. The second major shock was at 10:45 p.m. Over the next five months at least 300 more tremors were recorded. The strongest aftershock occurred on 4 December 1993, and measured
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Within three weeks after the first major shocks four seismographs were installed in the area by the U.S. Geological Survey. These were helpful in recording subsequent seismic activity.
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All of the shocks, from the first foreshock to the last aftershock some two months later, were clustered around latitude 4220'N and longitude 12205'W, west northwest of Klamath Falls.
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The tremors during the September 1993 Klamath Falls earthquakes were some of the strongest felt in Oregon's history over the past 50 years. The first shock was only 4.2 M
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The tremors precipitated landslides and also caused structural damage to buildings, including the county courthouse, in addition to private residences, businesses and
403:. The two major quakes, which measured 5.9 and 6.0, were, up to that point in Oregon's history, the strongest recorded earthquakes and resulted in the most damage. 997: 1755: 881: 505: 1333: 1796: 990: 805: 350:. The earthquakes were located at a depth of 5.6 miles (9 km) and tremors continued to be felt more than three months after the initial shocks. 1013: 481: 31: 1142: 653: 410:. The epicenter of the second major shock was slightly more to the north than the previous tremors. The major shocks were felt as far north as 1283: 1057: 1801: 1674: 853: 1458: 1062: 1694: 1443: 1298: 383:
The September 1993 earthquakes began striking at approximately 8:16 p.m. local time. The first major quake registered 5.9 on the
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which was used to partially fund upgrades to local public buildings, including the courthouse annex.
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years, only six were considered significant. Previously most tremors measured less than 4 M
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In the wake of the earthquakes, several damaged buildings in Klamath Falls and elsewhere in
557:"The 1993 Klamath Falls, Oregon, earthquake sequence: Source mechanisms from regional data" 285: 575: 429:
The destructive force of the 1993 Klamath Falls earthquakes was measured at VII on the
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Green, Ashbel S.; Long, James (21 September 1993). "Quakes rattle southern Oregon".
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Sherrod, D.R. (1993). "Historic and prehistoric earthquakes near Klamath Falls".
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Brantley, Steven R. "Klamath Falls, Oregon, Earthquakes on September 20, 1993".
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The epicenter of both earthquakes was located northwest of Klamath Falls in the
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Braunmiller, Jochen; Nabelek, John; Leitner, Beate (15 January 1995).
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Hull, Donald A. (1996). Ian P. Madin; Matthew M. Mabey (eds.).
531:"Scientists not surprised by quake magnitude or location". 342:, beginning on Monday, 20 September at 8:28 p.m. The 460:
had to be repaired. The city of Klamath Falls obtained a
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registered respective magnitudes of 6.0 and 5.9 on the
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indicates earthquake resulting in at least 30 deaths
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Northwest Economic Adjustment Initiative Assessment
441:. The second death was a result of a heart attack. 324: 303: 295: 281: 244: 236: 224: 208: 198: 190: 182: 174: 159: 149: 139: 128: 118: 108: 97: 89: 81: 64: 535:. Portland, Oregon. 22 September 1993. p. A1. 975:indicates the deadliest earthquake of the year 778:Thomas J. Wiley; et al. (November 1993). 998: 875: 550: 548: 546: 544: 542: 448:. Damage was estimated at $ 10 million. 8: 21: 1817:1993 natural disasters in the United States 815:. Forest Community Research. Archived from 1812:September 1993 events in the United States 1005: 991: 983: 882: 868: 860: 20: 622: 620: 618: 616: 214: 773: 771: 656:. U.S. Geological Survey. Archived from 499: 497: 482:List of earthquakes in the United States 806:"Klamath Falls, Klamath County, Oregon" 755: 753: 751: 749: 703:"Schools will not withstand earthquake" 696: 694: 493: 387:with a foreshock registering 4.2 M 648: 646: 644: 642: 764:. Portland, Oregon. pp. A10, E1. 47: 7: 506:"About the Klamath Falls earthquake" 722:"Earthquake hazard maps for Oregon" 446:historic buildings in Klamath Falls 371:with the strongest being 4.3 M 846:International Seismological Centre 508:. Living Local 360. Archived from 14: 629:Oregon, Earthquakes and Volcanoes 462:Community Development Block Grant 1797:Earthquakes in the United States 1014:Earthquakes in the United States 504:Totten, Michael (24 July 2009). 46: 37: 30: 354:Tectonics and previous activity 304: 336:1993 Klamath Falls earthquakes 22:1993 Klamath Falls earthquakes 1: 564:Geophysical Research Letters 1802:Natural disasters in Oregon 681:Earthquakes & Volcanoes 477:List of earthquakes in 1993 1833: 701:Beach, Lee (24 May 2007). 1675:2018 Southern Appalachian 965: 903: 408:Mountain Lakes Wilderness 26: 16:Earthquakes in Oregon, US 1063:1812 San Juan Capistrano 709:. Klamath Falls, Oregon. 431:Mercalli intensity scale 76:     1695:2020 Monte Cristo Range 1444:1986 North Palm Springs 1299:1948 Desert Hot Springs 72:Doublet earthquake 1746:2010–11 Guy-Greenbrier 1319:1957 Andreanof Islands 1143:1892 Vacaville–Winters 1088:1867 Manhattan, Kansas 654:"Historic earthquakes" 414:, and as far south as 385:moment magnitude scale 348:moment magnitude scale 1807:Klamath Falls, Oregon 1756:2009–present Oklahoma 1645:2014 Southeast Alaska 1640:2014 Aleutian Islands 1454:1987 Whittier Narrows 1364:1968 Borrego Mountain 1314:1954 Churchill County 1289:1946 Aleutian Islands 1284:1944 Cornwall–Massena 1184:1906 Aleutian Islands 1028:1585 Aleutian Islands 804:Zilverberg, Grace M. 425:Damage and casualties 340:Klamath Falls, Oregon 240:5.6 miles (9 km) 1605:2010 Baja California 1459:1987 Imperial Valley 1449:1986 Chalfant Valley 1409:1979 Imperial Valley 1204:1915 Pleasant Valley 1199:1915 Imperial Valley 361:Blanco Fracture Zone 1782:Doublet earthquakes 1685:2020 Salt Lake City 1630:2013 Port Alexander 1570:2006 Gulf of Mexico 1484:1992 Cape Mendocino 1249:1932 Cedar Mountain 1118:1872 North Cascades 894:Earthquakes in 1993 576:1995GeoRL..22..105B 512:on 21 February 2014 416:Redding, California 290:Northern California 262: /  93:1993-09-21 05:45:35 85:1993-09-21 03:28:55 23: 1690:2020 Central Idaho 1509:1993 Klamath Falls 1324:1957 San Francisco 1279:1940 New Hampshire 1259:1934 Hansel Valley 1229:1925 Santa Barbara 1219:1921 Sevier Valley 1179:1906 San Francisco 1138:1892 Laguna Salada 1068:1812 Santa Barbara 1058:1811–12 New Madrid 1033:1638 New Hampshire 854:authoritative data 734:on 1 February 2014 660:on 9 February 2010 601:on 2 February 2014 344:doublet earthquake 203:Doublet earthquake 163:September 20, 1993 1769: 1768: 1504:1993 Scotts Mills 1474:1991 Sierra Madre 1389:1975 Near Islands 1379:1971 San Fernando 1344:1962 Cache Valley 1189:1909 Wabash River 1123:1882 Fort Collins 1113:1872 Owens Valley 980: 979: 584:10.1029/94GL02844 332: 331: 1824: 1787:1993 earthquakes 1585:2008 Chino Hills 1529:1999 Hector Mine 1479:1992 Joshua Tree 1464:1989 Loma Prieta 1439:1984 Morgan Hill 1419:1981 Westmorland 1404:1979 Coyote Lake 1359:1965 Puget Sound 1354:1965 Rat Islands 1339:1959 Hebgen Lake 1309:1952 Kern County 1214:1918 San Jacinto 1158:1899 San Jacinto 1153:1898 Mare Island 1073:1838 San Andreas 1007: 1000: 993: 984: 884: 877: 870: 861: 832: 831: 829: 827: 821: 810: 801: 795: 794: 784: 775: 766: 765: 757: 744: 743: 741: 739: 733: 726: 717: 711: 710: 698: 689: 688: 676: 670: 669: 667: 665: 650: 637: 636: 624: 611: 610: 608: 606: 600: 594:. Archived from 561: 552: 537: 536: 528: 522: 521: 519: 517: 501: 320: 318: 306: 277: 276: 274: 273: 272: 267: 266:42.21°N 122.07°W 263: 260: 259: 258: 255: 219: 170: 168: 77: 50: 49: 41: 40: 34: 24: 1832: 1831: 1827: 1826: 1825: 1823: 1822: 1821: 1772: 1771: 1770: 1765: 1761:2019 Ridgecrest 1724: 1720:2024 New Jersey 1680:2019 Ridgecrest 1650:2014 South Napa 1575:2006 Kiholo Bay 1565:2003 San Simeon 1538: 1534:2000 Yountville 1524:1998 Pymatuning 1514:1994 Northridge 1499:1992 St. George 1429:1983 Borah Peak 1384:1973 Point Mugu 1374:1969 Santa Rosa 1334:1958 Lituya Bay 1269:1936 State Line 1254:1933 Long Beach 1162: 1148:1895 Charleston 1128:1886 Charleston 1103:1870 Charlevoix 1078:1857 Fort Tejon 1053:1783 New Jersey 1038:1663 Charlevoix 1016: 1011: 981: 976: 971: 961: 899: 888: 856:for this event. 841: 836: 835: 825: 823: 822:on 6 March 2012 819: 808: 803: 802: 798: 782: 777: 776: 769: 759: 758: 747: 737: 735: 731: 724: 719: 718: 714: 707:Herald and News 700: 699: 692: 678: 677: 673: 663: 661: 652: 651: 640: 626: 625: 614: 604: 602: 598: 559: 554: 553: 540: 530: 529: 525: 515: 513: 503: 502: 495: 490: 473: 454: 427: 402: 395: 390: 381: 374: 370: 356: 312: 310: 288: 286:Southern Oregon 270: 268: 264: 261: 256: 253: 251: 249: 248: 231: 218: 175:Local time 166: 164: 160:Local date 75: 60: 59: 58: 57: 56: 55: 51: 43: 42: 17: 12: 11: 5: 1830: 1828: 1820: 1819: 1814: 1809: 1804: 1799: 1794: 1792:1993 in Oregon 1789: 1784: 1774: 1773: 1767: 1766: 1764: 1763: 1758: 1753: 1748: 1743: 1738: 1732: 1730: 1726: 1725: 1723: 1722: 1717: 1712: 1707: 1702: 1697: 1692: 1687: 1682: 1677: 1672: 1670:2018 Anchorage 1667: 1662: 1657: 1652: 1647: 1642: 1637: 1632: 1627: 1622: 1617: 1612: 1607: 1602: 1597: 1592: 1587: 1582: 1577: 1572: 1567: 1562: 1557: 1552: 1550:2001 Nisqually 1546: 1544: 1540: 1539: 1537: 1536: 1531: 1526: 1521: 1516: 1511: 1506: 1501: 1496: 1491: 1486: 1481: 1476: 1471: 1466: 1461: 1456: 1451: 1446: 1441: 1436: 1431: 1426: 1421: 1416: 1411: 1406: 1401: 1396: 1391: 1386: 1381: 1376: 1371: 1366: 1361: 1356: 1351: 1346: 1341: 1336: 1331: 1326: 1321: 1316: 1311: 1306: 1301: 1296: 1294:1947 Wisconsin 1291: 1286: 1281: 1276: 1274:1940 El Centro 1271: 1266: 1261: 1256: 1251: 1246: 1241: 1239:1931 Valentine 1236: 1231: 1226: 1221: 1216: 1211: 1206: 1201: 1196: 1191: 1186: 1181: 1176: 1174:1901 Richfield 1170: 1168: 1164: 1163: 1161: 1160: 1155: 1150: 1145: 1140: 1135: 1130: 1125: 1120: 1115: 1110: 1105: 1100: 1095: 1090: 1085: 1080: 1075: 1070: 1065: 1060: 1055: 1050: 1045: 1040: 1035: 1030: 1024: 1022: 1018: 1017: 1012: 1010: 1009: 1002: 995: 987: 978: 977: 966: 963: 962: 960: 959: 955:(6.9, Oct 13) 950: 943:(6.2, Sep 30) 938: 932: 926: 922:(7.7, Jul 12) 917: 911: 904: 901: 900: 889: 887: 886: 879: 872: 864: 858: 857: 840: 839:External links 837: 834: 833: 796: 787:Oregon Geology 767: 745: 712: 690: 671: 638: 612: 570:(2): 105–108. 538: 523: 492: 491: 489: 486: 485: 484: 479: 472: 469: 458:Klamath County 453: 450: 426: 423: 412:Eugene, Oregon 400: 393: 388: 380: 377: 372: 368: 355: 352: 338:took place in 330: 329: 326: 322: 321: 308: 301: 300: 297: 293: 292: 283: 282:Areas affected 279: 278: 271:42.21; -122.07 246: 242: 241: 238: 234: 233: 229: 226: 222: 221: 216: 210: 206: 205: 200: 196: 195: 192: 188: 187: 184: 180: 179: 176: 172: 171: 161: 157: 156: 151: 147: 146: 141: 137: 136: 133: 126: 125: 120: 116: 115: 110: 106: 105: 102: 95: 94: 91: 87: 86: 83: 79: 78: 69: 62: 61: 53: 52: 45: 44: 36: 35: 29: 28: 27: 15: 13: 10: 9: 6: 4: 3: 2: 1829: 1818: 1815: 1813: 1810: 1808: 1805: 1803: 1800: 1798: 1795: 1793: 1790: 1788: 1785: 1783: 1780: 1779: 1777: 1762: 1759: 1757: 1754: 1752: 1749: 1747: 1744: 1742: 1739: 1737: 1734: 1733: 1731: 1727: 1721: 1718: 1716: 1713: 1711: 1710:2022 Ferndale 1708: 1706: 1703: 1701: 1698: 1696: 1693: 1691: 1688: 1686: 1683: 1681: 1678: 1676: 1673: 1671: 1668: 1666: 1663: 1661: 1658: 1656: 1655:2016 Oklahoma 1653: 1651: 1648: 1646: 1643: 1641: 1638: 1636: 1635:2014 La Habra 1633: 1631: 1628: 1626: 1625:2011 Oklahoma 1623: 1621: 1620:2011 Virginia 1618: 1616: 1615:2011 Colorado 1613: 1611: 1608: 1606: 1603: 1601: 1598: 1596: 1593: 1591: 1588: 1586: 1583: 1581: 1580:2008 Illinois 1578: 1576: 1573: 1571: 1568: 1566: 1563: 1561: 1558: 1556: 1553: 1551: 1548: 1547: 1545: 1541: 1535: 1532: 1530: 1527: 1525: 1522: 1520: 1519:1995 Marathon 1517: 1515: 1512: 1510: 1507: 1505: 1502: 1500: 1497: 1495: 1494:1992 Big Bear 1492: 1490: 1487: 1485: 1482: 1480: 1477: 1475: 1472: 1470: 1467: 1465: 1462: 1460: 1457: 1455: 1452: 1450: 1447: 1445: 1442: 1440: 1437: 1435: 1432: 1430: 1427: 1425: 1424:1983 Coalinga 1422: 1420: 1417: 1415: 1412: 1410: 1407: 1405: 1402: 1400: 1397: 1395: 1392: 1390: 1387: 1385: 1382: 1380: 1377: 1375: 1372: 1370: 1369:1968 Illinois 1367: 1365: 1362: 1360: 1357: 1355: 1352: 1350: 1347: 1345: 1342: 1340: 1337: 1335: 1332: 1330: 1327: 1325: 1322: 1320: 1317: 1315: 1312: 1310: 1307: 1305: 1302: 1300: 1297: 1295: 1292: 1290: 1287: 1285: 1282: 1280: 1277: 1275: 1272: 1270: 1267: 1265: 1262: 1260: 1257: 1255: 1252: 1250: 1247: 1245: 1242: 1240: 1237: 1235: 1232: 1230: 1227: 1225: 1222: 1220: 1217: 1215: 1212: 1210: 1209:1916 Irondale 1207: 1205: 1202: 1200: 1197: 1195: 1192: 1190: 1187: 1185: 1182: 1180: 1177: 1175: 1172: 1171: 1169: 1165: 1159: 1156: 1154: 1151: 1149: 1146: 1144: 1141: 1139: 1136: 1134: 1131: 1129: 1126: 1124: 1121: 1119: 1116: 1114: 1111: 1109: 1106: 1104: 1101: 1099: 1096: 1094: 1091: 1089: 1086: 1084: 1081: 1079: 1076: 1074: 1071: 1069: 1066: 1064: 1061: 1059: 1056: 1054: 1051: 1049: 1048:1755 Cape Ann 1046: 1044: 1043:1700 Cascadia 1041: 1039: 1036: 1034: 1031: 1029: 1026: 1025: 1023: 1019: 1015: 1008: 1003: 1001: 996: 994: 989: 988: 985: 974: 969: 964: 958: 954: 951: 949: 946: 942: 939: 937:(6.0, Sep 21) 936: 935:Klamath Falls 933: 930: 927: 925: 921: 918: 916:(5.6, Mar 25) 915: 912: 910:(7.6, Jan 15) 909: 906: 905: 902: 898: 895: 892: 885: 880: 878: 873: 871: 866: 865: 862: 855: 851: 847: 843: 842: 838: 818: 814: 807: 800: 797: 792: 788: 781: 774: 772: 768: 763: 762:The Oregonian 756: 754: 752: 750: 746: 730: 723: 716: 713: 708: 704: 697: 695: 691: 686: 682: 675: 672: 659: 655: 649: 647: 645: 643: 639: 634: 630: 623: 621: 619: 617: 613: 597: 593: 589: 585: 581: 577: 573: 569: 565: 558: 551: 549: 547: 545: 543: 539: 534: 533:The Oregonian 527: 524: 511: 507: 500: 498: 494: 487: 483: 480: 478: 475: 474: 470: 468: 465: 463: 459: 451: 449: 447: 442: 440: 439:U.S. Route 97 436: 432: 424: 422: 419: 417: 413: 409: 404: 397: 386: 378: 376: 364: 362: 353: 351: 349: 345: 341: 337: 327: 323: 319: 316: 309: 302: 298: 294: 291: 287: 284: 280: 275: 247: 243: 239: 235: 227: 223: 220: 211: 207: 204: 201: 197: 193: 189: 185: 181: 177: 173: 162: 158: 155: 152: 148: 145: 142: 138: 134: 132: 127: 124: 121: 117: 114: 111: 107: 103: 100: 96: 92: 88: 84: 80: 73: 70: 67: 63: 54:Klamath Falls 33: 25: 19: 1751:2012 Brawley 1705:2021 Chignik 1610:2010 Indiana 1560:2003 Alabama 1543:21st century 1508: 1489:1992 Landers 1304:1949 Olympia 1224:1925 Montana 1167:20th century 1098:1868 Hayward 1083:1865 Memphis 972: 967: 956: 947: 944: 934: 931:(7.8, Aug 8) 923: 914:Scotts Mills 850:bibliography 824:. Retrieved 817:the original 812: 799: 790: 786: 761: 736:. Retrieved 729:the original 715: 706: 684: 680: 674: 662:. Retrieved 658:the original 632: 628: 603:. Retrieved 596:the original 567: 563: 532: 526: 514:. Retrieved 510:the original 466: 455: 443: 428: 420: 405: 398: 382: 365: 357: 335: 333: 314: 299:$ 10 million 296:Total damage 18: 1700:2020 Sparta 1665:2018 Hawaii 1660:2018 Alaska 1600:2010 Eureka 1555:2002 Denali 1469:1990 Upland 1434:1983 Kaoiki 1414:1980 Eureka 1399:1975 Hawaii 1394:1975 Morris 1349:1964 Alaska 1329:1958 Huslia 1264:1935 Helena 1244:1932 Eureka 1234:1927 Lompoc 1133:1887 Sonora 1108:1871 LānaÊ»i 1093:1868 Hawaii 315:Very strong 269: / 101: event 1776:Categories 1736:2001 Enola 1715:2023 Texas 1595:2008 Wells 1021:Historical 953:Finisterre 826:26 January 738:26 January 664:26 January 635:: 106–120. 605:26 January 488:References 435:rock slide 379:Earthquake 325:Casualties 194:10:45 p.m. 167:1993-09-20 68: time 1741:2008 Reno 1590:2008 Reno 1194:1914 Reno 793:(6): 127. 687:(3): 104. 592:128472543 452:Aftermath 375:in 1948. 313:MMI VII ( 307:intensity 245:Epicenter 199:Magnitude 186:8:28 p.m. 920:Hokkaidō 908:Hokkaidō 516:22 March 471:See also 257:122°04′W 852:and/or 572:Bibcode 254:42°13′N 232:  165: ( 1729:Swarms 848:has a 590:  328:2 dead 225:  209:  191:  183:  178:  154:ComCat 150:  144:ComCat 140:  135:  123:209133 119:  113:209100 109:  104:  90:  82:  941:Latur 820:(PDF) 809:(PDF) 783:(PDF) 732:(PDF) 725:(PDF) 599:(PDF) 588:S2CID 560:(PDF) 237:Depth 228:5.9 M 129:USGS- 929:Guam 844:The 828:2014 740:2014 666:2014 607:2014 518:2014 392:5.4M 334:The 305:Max. 212:6.0 131:ANSS 580:doi 437:on 99:ISC 66:UTC 1778:: 811:. 791:55 789:. 785:. 770:^ 748:^ 705:. 693:^ 685:24 683:. 641:^ 633:24 631:. 615:^ 586:. 578:. 568:22 566:. 562:. 541:^ 496:^ 418:. 396:. 1006:e 999:t 992:v 973:‡ 968:† 957:† 948:‡ 945:† 924:† 897:→ 891:← 883:e 876:t 869:v 830:. 742:. 668:. 609:. 582:: 574:: 520:. 401:w 394:w 389:w 373:w 369:w 317:) 230:w 217:w 215:M 169:) 74::

Index

1993 Klamath Falls earthquakes is located in Oregon
UTC
Doublet earthquake
ISC
209100
209133
ANSS
ComCat
ComCat
Doublet earthquake
Mw
42°13′N 122°04′W / 42.21°N 122.07°W / 42.21; -122.07
Southern Oregon
Northern California
MMI VII (Very strong)
Klamath Falls, Oregon
doublet earthquake
moment magnitude scale
Blanco Fracture Zone
moment magnitude scale
Mountain Lakes Wilderness
Eugene, Oregon
Redding, California
Mercalli intensity scale
rock slide
U.S. Route 97
historic buildings in Klamath Falls
Klamath County
Community Development Block Grant
List of earthquakes in 1993

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