Knowledge (XXG)

1935 Helena earthquake

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27: 334: 376:'s Camp Cooney. The first night, 400 people stayed there, but most had found space with friends or family outside of the damaged area by the end of the week. Many other people lived in tents around the town for the next few weeks, either due to damaged property or for fear of aftershocks. The National Guard were deployed in Helena to keep sightseers away from the damaged buildings, there was no looting. 2787: 48: 34: 288:(ISB). This area of relatively intense seismicity runs roughly north-south from northwestern Arizona, through Utah, Idaho, and Wyoming, before dying out in northwestern Montana. It shows a marked deflection to the northwest near Helena, where it intersects with the Lewis and Clark fault zone, a zone of older WNW-trending faults. The ISB is characterized by 324:
The sequence began with a small earthquake on October 3. It was followed by a damaging earthquake on October 12 (magnitude 5.9, intensity VII), the mainshock on October 18 (magnitude 6.2, intensity VIII), the large aftershock on October 31 (magnitude 6.0, intensity VIII) and a further large
350:, which was completed in August 1935 and had just been dedicated in early October. The school buildings, which had cost $ 500,000, had not been designed to be earthquake resistant. Another building that was totally destroyed and had to be rebuilt was the 341:
There was widespread damage to unreinforced masonry structures in the Helena area with more than 200 chimneys being destroyed. The strongest effects were seen in the northeast, where buildings were constructed on
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on October 31 of magnitude 6.0 and a maximum intensity of VIII. Two people died in the mainshock and two others died as a result of the October 31 aftershock. Property damage was over $ 4 million.
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office of Disaster and Emergency Services estimated that a 6.3 magnitude earthquake today would result in property damage over $ 500 million. Another concern for future earthquakes in the area is
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National Geophysical Data Center / World Data Service (NGDC/WDS): NCEI/WDS Global Significant Earthquake Database. NOAA National Centers for Environmental Information. (1972).
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National Geophysical Data Center / World Data Service (NGDC/WDS): NCEI/WDS Global Significant Earthquake Database. NOAA National Centers for Environmental Information. (1972).
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Two people were killed by falling bricks in Helena during the October 18 shock. Two brick masons died as a result of the October 31 aftershock, while removing a brick tower.
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The aftershock of October 31 caused an estimated $ 1 million of further property damage, particularly to structures already weakened by the October 18 shock.
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aftershock on November 28 (magnitude 5.5, intensity VI). There were a total of 1800 temblors recorded between October 4, 1935, and April 30, 1936.
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The west wing of the Helena High School after its collapse during the October 31 aftershock following damage during the October 18 mainshock
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soil, and in the southern business district, which contained many brick buildings. The most extensively damaged building was the
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Tobin, Sandy (1988). "Odyssey of a Caring Institution: The Cooney Convalescent Home and Hospital". In Paladin, Vivian A. (ed.).
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Wong, I.; Olig, S.; Dober, M.; Wright, D.; Nemser, E.; Lageson, D.; Silva, W.; Stickney, M.; Lemieux, M.; Anderson, L. (2004).
385: 2033: 2008: 1918: 1857: 1627: 1597: 1466: 1062: 406: 974: 697: 2587: 2240: 2038: 1978: 1672: 1607: 1577: 1567: 1527: 1486: 1381: 1172: 648:"Source parameters of Montana earthquakes (1925–1964) and tectonic deformation in the northern Intermountain Seismic Belt" 2682: 2607: 2346: 2208: 1852: 1822: 1737: 1727: 1692: 1537: 1471: 1461: 1456: 2772: 2737: 2657: 2489: 2230: 2225: 2109: 2028: 1933: 1877: 1827: 1812: 1787: 1767: 1752: 1722: 1707: 1702: 1687: 1657: 1562: 1506: 1501: 1421: 1278: 1247: 1230: 1183: 1146: 1082: 1030: 998: 951: 881: 804: 401: 373: 139: 2732: 2727: 2552: 2512: 2497: 2068: 1998: 1923: 1913: 1882: 1872: 1862: 1847: 1777: 1732: 1617: 1602: 1496: 1476: 1451: 1426: 1401: 1386: 1286: 1135: 1099: 922: 60: 2811: 2762: 2707: 2667: 2602: 2361: 2252: 2188: 2018: 1993: 1898: 1642: 1622: 1587: 1522: 1013: 983: 968: 928: 2826: 2752: 2722: 2702: 2672: 2652: 2577: 2572: 2567: 2532: 2502: 2203: 2058: 2003: 1983: 1973: 1968: 1963: 1928: 1867: 1842: 1772: 1717: 1557: 1396: 1391: 1301: 1166: 1053: 1038: 992: 502: 432: 301: 269: 760: 2717: 2712: 2697: 2692: 2677: 2647: 2642: 2632: 2627: 2622: 2592: 2582: 2542: 2527: 2404: 2053: 1958: 1908: 1837: 1652: 1572: 1446: 1431: 1416: 1255: 1236: 1117: 1090: 1068: 907: 2767: 2757: 2687: 2637: 2562: 2557: 2547: 2537: 2522: 2517: 2507: 2318: 2084: 2048: 2013: 1948: 1903: 1817: 1782: 1762: 1747: 1742: 1697: 1677: 1592: 1582: 1481: 1441: 1215: 1047: 959: 916: 898: 261: 220: 124: 2747: 2742: 2135: 2089: 2063: 1943: 1938: 1542: 1264: 1206: 1126: 1004: 297: 476: 2662: 2612: 2597: 2419: 2099: 889: 723: 663: 2459: 2454: 2308: 2278: 2273: 2245: 1295: 1108: 937: 392:, especially in the area north of the city where there are alluvial soils and a high water table. 333: 2479: 2449: 2439: 2213: 2175: 347: 272:. The temblor on that date was the largest of a series of earthquakes that also included a large 2464: 2424: 2414: 2389: 2384: 2379: 389: 90: 834: 77: 2394: 2283: 2128: 671: 506: 436: 2474: 2469: 2444: 2434: 2409: 2356: 2336: 2165: 309: 305: 289: 257: 174: 667: 594: 2791: 2429: 2399: 565: 308:
of the two largest earthquakes of the 1935 sequence are consistent with right lateral
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on faults similar in trend to two major mapped NW-SE faults, the Bald Butte and
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Valleys of the Prickly Pear : a History of the Valleys of the Prickly Pear
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13th World Conference on Earthquake Engineering Vancouver, B.C., Canada
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U.S. Geological Survey Water-Resources Investigations Report 00-4212
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4 (2 from the mainshock and 2 from the aftershock of October 31)
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indicates earthquake resulting in at least 30 deaths
595:"Quaternary Faults and Seismicity in Western Montana" 1041:(8.2 & 7.7 & 7.0, June 3 & 18 & 22) 2488: 2370: 2327: 2266: 2174: 2077: 1891: 1515: 1369: 1277: 1246: 1182: 1145: 1081: 1029: 950: 880: 593:Stickney, M.; Haller, K.M.; Machette, M.N. (2000). 230: 215: 194: 180: 170: 133: 119: 111: 96: 83: 70: 59: 245: 368:A temporary camp was set up by the Red Cross and 264:scale and a maximum perceived intensity of VIII ( 652:Bulletin of the Seismological Society of America 1324:indicates the deadliest earthquake of the year 47: 2136: 1347: 860: 8: 533: 531: 529: 527: 284:Helena lies within the northern part of the 16: 2832:1935 natural disasters in the United States 2143: 2129: 2121: 1354: 1340: 1332: 867: 853: 845: 15: 726:. University of Utah Seismograph Stations 496: 494: 412:List of earthquakes in the United States 384:A computer simulation performed for the 332: 747: 745: 743: 741: 423: 370:Federal Emergency Relief Administration 463: 461: 459: 457: 619:Thamke, J.N.; Reynolds, M.W. (2000). 600:. Montana Bureau of Mines and Geology 7: 503:"Significant Earthquake Information" 433:"Significant Earthquake Information" 724:"Summary of Helena 1935 earthquake" 260:. It had a magnitude of 6.2 on the 831:International Seismological Centre 14: 696:James, C.; Hernandez, L. (1998). 2817:Earthquakes in the United States 2785: 2352:Regional designations of Montana 1363:Earthquakes in the United States 660:Seismological Society of America 46: 32: 25: 352:Lewis and Clark County Hospital 300:, as recognized throughout the 195: 407:List of earthquakes in Montana 33: 1: 801:"Liquefaction Susceptibility" 752:Montana Army National Guard. 2822:Natural disasters in Montana 475:. USGS. 2009. Archived from 402:List of earthquakes in 1935 374:Montana Army National Guard 2848: 286:Intermountain Seismic Belt 246:22:48:02 MDT on October 18 2781: 2194:Congressional delegations 2162: 2024:2018 Southern Appalachian 1314: 21: 1412:1812 San Juan Capistrano 875:Earthquakes in the 1930s 754:"1935 Helena Earthquake" 302:Basin and Range province 270:Mercalli intensity scale 2044:2020 Monte Cristo Range 1793:1986 North Palm Springs 1648:1948 Desert Hot Springs 698:"Helena, Montana, 1935" 296:age, indicating active 2095:2010–11 Guy-Greenbrier 1668:1957 Andreanof Islands 1492:1892 Vacaville–Winters 1437:1867 Manhattan, Kansas 676:10.1785/BSSA0790010031 386:Lewis and Clark County 338: 262:surface wave magnitude 242:1935 Helena earthquake 17:1935 Helena earthquake 2347:Glacier National Park 2105:2009–present Oklahoma 1994:2014 Southeast Alaska 1989:2014 Aleutian Islands 1803:1987 Whittier Narrows 1713:1968 Borrego Mountain 1663:1954 Churchill County 1638:1946 Aleutian Islands 1633:1944 Cornwall–Massena 1533:1906 Aleutian Islands 1377:1585 Aleutian Islands 1192:Erdek–Marmara Islands 336: 298:extensional tectonics 1954:2010 Baja California 1808:1987 Imperial Valley 1798:1986 Chalfant Valley 1758:1979 Imperial Valley 1553:1915 Pleasant Valley 1548:1915 Imperial Valley 646:Doser, D.I. (1989). 473:Historic Earthquakes 310:strike-slip faulting 2258:Tourist attractions 2246:The Last Best Place 2034:2020 Salt Lake City 1979:2013 Port Alexander 1919:2006 Gulf of Mexico 1833:1992 Cape Mendocino 1598:1932 Cedar Mountain 1467:1872 North Cascades 807:on 25 December 2012 668:1989BuSSA..79...31D 380:Modern-day concerns 320:Earthquake sequence 151: /  66:1935-10-19 04:48:02 18: 2792:Montana portal 2039:2020 Central Idaho 1858:1993 Klamath Falls 1673:1957 San Francisco 1628:1940 New Hampshire 1608:1934 Hansel Valley 1578:1925 Santa Barbara 1568:1921 Sevier Valley 1528:1906 San Francisco 1487:1892 Laguna Salada 1417:1812 Santa Barbara 1407:1811–12 New Madrid 1382:1638 New Hampshire 1157:(8.0, January 15) 839:authoritative data 627:. USGS. p. 14 348:Helena High School 339: 304:to the south. The 2799: 2798: 2118: 2117: 1853:1993 Scotts Mills 1823:1991 Sierra Madre 1738:1975 Near Islands 1728:1971 San Fernando 1693:1962 Cache Valley 1538:1909 Wabash River 1472:1882 Fort Collins 1462:1872 Owens Valley 1329: 1328: 390:soil liquefaction 238: 237: 2839: 2812:1935 earthquakes 2790: 2789: 2788: 2145: 2138: 2131: 2122: 1934:2008 Chino Hills 1878:1999 Hector Mine 1828:1992 Joshua Tree 1813:1989 Loma Prieta 1788:1984 Morgan Hill 1768:1981 Westmorland 1753:1979 Coyote Lake 1708:1965 Puget Sound 1703:1965 Rat Islands 1688:1959 Hebgen Lake 1658:1952 Kern County 1563:1918 San Jacinto 1507:1899 San Jacinto 1502:1898 Mare Island 1422:1838 San Andreas 1356: 1349: 1342: 1333: 1198:Shinchiku-Taichū 869: 862: 855: 846: 817: 816: 814: 812: 797: 791: 790: 782: 776: 775: 773: 771: 765: 759:. Archived from 758: 749: 736: 735: 733: 731: 720: 714: 713: 711: 709: 693: 687: 686: 684: 682: 643: 637: 636: 634: 632: 616: 610: 609: 607: 605: 599: 590: 584: 583: 581: 579: 570: 561: 555: 554: 552: 550: 535: 522: 521: 519: 517: 511:10.7289/V5TD9V7K 498: 489: 488: 486: 484: 465: 452: 451: 449: 447: 441:10.7289/V5TD9V7K 428: 280:Tectonic setting 247: 226:Oct 31 at 18:37 211: 209: 197: 166: 165: 163: 162: 161: 156: 152: 149: 148: 147: 144: 107: 105: 100:October 18, 1935 50: 49: 36: 35: 29: 19: 2847: 2846: 2842: 2841: 2840: 2838: 2837: 2836: 2827:1935 in Montana 2802: 2801: 2800: 2795: 2786: 2784: 2777: 2618:Lewis and Clark 2484: 2366: 2357:Western Montana 2337:Eastern Montana 2323: 2262: 2231:Protected areas 2170: 2158: 2149: 2119: 2114: 2110:2019 Ridgecrest 2073: 2069:2024 New Jersey 2029:2019 Ridgecrest 1999:2014 South Napa 1924:2006 Kiholo Bay 1914:2003 San Simeon 1887: 1883:2000 Yountville 1873:1998 Pymatuning 1863:1994 Northridge 1848:1992 St. George 1778:1983 Borah Peak 1733:1973 Point Mugu 1723:1969 Santa Rosa 1683:1958 Lituya Bay 1618:1936 State Line 1603:1933 Long Beach 1511: 1497:1895 Charleston 1477:1886 Charleston 1452:1870 Charlevoix 1427:1857 Fort Tejon 1402:1783 New Jersey 1387:1663 Charlevoix 1365: 1360: 1330: 1325: 1320: 1310: 1273: 1242: 1178: 1175:(6.6, March 12) 1141: 1077: 1025: 946: 876: 873: 841:for this event. 826: 821: 820: 810: 808: 799: 798: 794: 784: 783: 779: 769: 767: 763: 756: 751: 750: 739: 729: 727: 722: 721: 717: 707: 705: 695: 694: 690: 680: 678: 645: 644: 640: 630: 628: 618: 617: 613: 603: 601: 597: 592: 591: 587: 577: 575: 568: 563: 562: 558: 548: 546: 537: 536: 525: 515: 513: 500: 499: 492: 482: 480: 467: 466: 455: 445: 443: 430: 429: 425: 420: 398: 382: 372:on land at the 366: 331: 322: 306:focal mechanism 290:normal faulting 282: 224: 203: 201: 159: 157: 153: 150: 145: 142: 140: 138: 137: 128: 112:Local time 103: 101: 97:Local date 55: 54: 53: 52: 51: 43: 42: 41: 37: 12: 11: 5: 2845: 2843: 2835: 2834: 2829: 2824: 2819: 2814: 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2588:Golden Valley 2586: 2584: 2581: 2579: 2576: 2574: 2571: 2569: 2566: 2564: 2561: 2559: 2556: 2554: 2551: 2549: 2546: 2544: 2541: 2539: 2536: 2534: 2531: 2529: 2526: 2524: 2521: 2519: 2516: 2514: 2511: 2509: 2506: 2504: 2501: 2499: 2496: 2495: 2493: 2491: 2487: 2481: 2478: 2476: 2473: 2471: 2468: 2466: 2463: 2461: 2458: 2456: 2453: 2451: 2448: 2446: 2443: 2441: 2438: 2436: 2433: 2431: 2428: 2426: 2423: 2421: 2418: 2416: 2413: 2411: 2408: 2406: 2403: 2401: 2398: 2396: 2393: 2391: 2388: 2386: 2383: 2381: 2378: 2377: 2375: 2373: 2369: 2363: 2360: 2358: 2355: 2353: 2350: 2348: 2345: 2343: 2340: 2338: 2335: 2334: 2332: 2330: 2326: 2320: 2317: 2315: 2312: 2310: 2307: 2305: 2302: 2300: 2297: 2295: 2292: 2290: 2287: 2285: 2282: 2280: 2277: 2275: 2272: 2271: 2269: 2265: 2259: 2256: 2254: 2251: 2247: 2244: 2243: 2242: 2241:State symbols 2239: 2237: 2234: 2232: 2229: 2227: 2224: 2220: 2217: 2216: 2215: 2212: 2210: 2207: 2205: 2202: 2200: 2197: 2195: 2192: 2190: 2187: 2185: 2182: 2181: 2179: 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1796: 1794: 1791: 1789: 1786: 1784: 1781: 1779: 1776: 1774: 1773:1983 Coalinga 1771: 1769: 1766: 1764: 1761: 1759: 1756: 1754: 1751: 1749: 1746: 1744: 1741: 1739: 1736: 1734: 1731: 1729: 1726: 1724: 1721: 1719: 1718:1968 Illinois 1716: 1714: 1711: 1709: 1706: 1704: 1701: 1699: 1696: 1694: 1691: 1689: 1686: 1684: 1681: 1679: 1676: 1674: 1671: 1669: 1666: 1664: 1661: 1659: 1656: 1654: 1651: 1649: 1646: 1644: 1641: 1639: 1636: 1634: 1631: 1629: 1626: 1624: 1621: 1619: 1616: 1614: 1611: 1609: 1606: 1604: 1601: 1599: 1596: 1594: 1591: 1589: 1586: 1584: 1581: 1579: 1576: 1574: 1571: 1569: 1566: 1564: 1561: 1559: 1558:1916 Irondale 1556: 1554: 1551: 1549: 1546: 1544: 1541: 1539: 1536: 1534: 1531: 1529: 1526: 1524: 1521: 1520: 1518: 1514: 1508: 1505: 1503: 1500: 1498: 1495: 1493: 1490: 1488: 1485: 1483: 1480: 1478: 1475: 1473: 1470: 1468: 1465: 1463: 1460: 1458: 1455: 1453: 1450: 1448: 1445: 1443: 1440: 1438: 1435: 1433: 1430: 1428: 1425: 1423: 1420: 1418: 1415: 1413: 1410: 1408: 1405: 1403: 1400: 1398: 1397:1755 Cape Ann 1395: 1393: 1392:1700 Cascadia 1390: 1388: 1385: 1383: 1380: 1378: 1375: 1374: 1372: 1368: 1364: 1357: 1352: 1350: 1345: 1343: 1338: 1337: 1334: 1323: 1318: 1313: 1307: 1303: 1300: 1297: 1294: 1292: 1288: 1285: 1284: 1282: 1280: 1276: 1270: 1267:(7.0, Aug 1) 1266: 1263: 1261: 1257: 1254: 1253: 1251: 1249: 1245: 1239:(7.7, Dec 28) 1238: 1235: 1232: 1229: 1227:(6.2, Oct 19) 1226: 1223: 1221: 1217: 1214: 1212: 1209:(6.1, May 1) 1208: 1205: 1203: 1199: 1196: 1193: 1190: 1189: 1187: 1185: 1181: 1174: 1173:Hansel Valley 1171: 1168: 1165: 1163: 1160: 1156: 1153: 1152: 1150: 1148: 1144: 1138:(7.7, Nov 20) 1137: 1134: 1132: 1129:(7.3 Aug 25) 1128: 1125: 1123: 1119: 1116: 1114: 1110: 1107: 1105: 1101: 1098: 1096: 1093:(8.4, Mar 2) 1092: 1089: 1088: 1086: 1084: 1080: 1074: 1070: 1067: 1065:(7.2, Dec 20) 1064: 1061: 1059: 1055: 1052: 1050:(6.4, June 6) 1049: 1046: 1044: 1040: 1037: 1036: 1034: 1032: 1028: 1022:(7.3, Sep 25) 1021: 1018: 1016:(6.5, Aug 16) 1015: 1012: 1010: 1006: 1003: 1001:(6.1, June 7) 1000: 997: 995:(6.5, Apr 27) 994: 991: 989: 985: 982: 980: 977:(7.8, Feb 3) 976: 973: 971:(7.6, Jan 28) 970: 967: 965: 961: 958: 957: 955: 953: 949: 943: 940:(7.3, Dec 4) 939: 936: 934: 930: 927: 925:(5,8, Oct 30) 924: 921: 919:(7.1, July 3) 918: 915: 913: 909: 906: 904: 901:(7.1, May 6) 900: 897: 895: 892:(7.5, May 5) 891: 888: 887: 885: 883: 879: 870: 865: 863: 858: 856: 851: 850: 847: 840: 836: 832: 828: 827: 823: 806: 802: 796: 793: 788: 781: 778: 766:on 2016-03-04 762: 755: 748: 746: 744: 742: 738: 725: 719: 716: 704:on 2012-09-28 703: 699: 692: 689: 677: 673: 669: 665: 661: 657: 653: 649: 642: 639: 626: 622: 615: 612: 596: 589: 586: 574: 567: 560: 557: 545:on 2012-08-13 544: 540: 534: 532: 530: 528: 524: 512: 508: 504: 497: 495: 491: 479:on 8 May 2012 478: 474: 470: 464: 462: 460: 458: 454: 442: 438: 434: 427: 424: 417: 413: 410: 408: 405: 403: 400: 399: 395: 393: 391: 387: 379: 377: 375: 371: 363: 361: 358: 355: 353: 349: 345: 335: 328: 326: 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Retrieved 426: 383: 367: 359: 356: 340: 323: 285: 283: 265: 244:occurred at 241: 239: 205: 160:46.6; -112.0 2773:Yellowstone 2738:Sweet Grass 2658:Musselshell 2420:Great Falls 2362:Yellowstone 2319:LGBT rights 2049:2020 Sparta 2014:2018 Hawaii 2009:2018 Alaska 1949:2010 Eureka 1904:2002 Denali 1818:1990 Upland 1783:1983 Kaoiki 1763:1980 Eureka 1748:1975 Hawaii 1743:1975 Morris 1698:1964 Alaska 1678:1958 Huslia 1613:1935 Helena 1593:1932 Eureka 1583:1927 Lompoc 1482:1887 Sonora 1457:1871 Lānaʻi 1442:1868 Hawaii 1231:Timiskaming 975:Hawke's Bay 216:Aftershocks 175:Strike-slip 158: / 74: event 2806:Categories 2733:Stillwater 2728:Silver Bow 2553:Deer Lodge 2513:Broadwater 2498:Beaverhead 2460:Miles City 2455:Livingston 2204:Government 2085:2001 Enola 2064:2023 Texas 1944:2008 Wells 1370:Historical 1136:Baffin Bay 1100:Long Beach 923:Senigallia 418:References 294:Quaternary 274:aftershock 252:, with an 231:Casualties 204:MMI VIII ( 104:1935-10-18 63: time 2763:Wheatland 2708:Roosevelt 2668:Petroleum 2603:Jefferson 2480:Whitefish 2450:Lewistown 2440:Kalispell 2304:Education 2209:Governors 2199:Geography 2169:(capital) 2090:2008 Reno 1939:2008 Reno 1543:1914 Reno 999:North Sea 984:Nicaragua 969:Myitkyina 929:North Izu 662:: 31–50. 364:Aftermath 268:) on the 254:epicenter 198:intensity 134:Epicenter 120:Magnitude 2753:Treasure 2723:Sheridan 2703:Richland 2673:Phillips 2653:Missoula 2578:Garfield 2573:Gallatin 2568:Flathead 2533:Chouteau 2503:Big Horn 2490:Counties 2465:Missoula 2425:Hamilton 2415:Glendive 2390:Billings 2385:Belgrade 2380:Anaconda 2314:Politics 2309:Gun laws 2279:Cannabis 2274:Abortion 1302:Erzincan 1167:Pahiatua 1054:Ierissos 993:Zangezur 516:22 March 446:22 March 396:See also 344:alluvial 316:Faults. 292:of late 146:112°00′W 2718:Sanders 2713:Rosebud 2698:Ravalli 2693:Prairie 2678:Pondera 2648:Mineral 2643:Meagher 2633:Madison 2628:Lincoln 2623:Liberty 2593:Granite 2583:Glacier 2543:Daniels 2528:Cascade 2395:Bozeman 2329:Regions 2299:Economy 2289:Culture 2267:Society 2214:History 2156:Montana 1287:Chillán 1256:Orizaba 1237:Sumatra 1118:Sumatra 1091:Sanriku 1069:Changma 1039:Jalisco 1020:Sumatra 908:Irpinia 837:and/or 664:Bibcode 604:11 July 578:11 July 250:Montana 185:Montana 143:46°36′N 102: ( 2768:Wibaux 2758:Valley 2688:Powell 2638:McCone 2563:Fergus 2558:Fallon 2548:Dawson 2538:Custer 2523:Carter 2518:Carbon 2508:Blaine 2475:Sidney 2470:Polson 2445:Laurel 2435:Helena 2410:Dillon 2236:Sports 2226:People 2176:Topics 2166:Helena 2078:Swarms 1225:Helena 1216:Quetta 1048:Eureka 960:Oaxaca 917:Dhubri 899:Salmas 833:has a 811:8 July 770:8 July 730:8 July 708:8 July 681:8 July 631:8 July 549:8 July 483:8 July 329:Damage 266:Severe 258:Helena 206:Severe 91:ComCat 78:904601 40:Helena 2748:Toole 2743:Teton 2430:Havre 2400:Butte 2284:Crime 2184:Index 2152:State 1207:Digor 1155:Bihar 1127:Diexi 1014:Texas 1005:Fuyun 764:(PDF) 757:(PDF) 658:(1). 598:(PDF) 569:(PDF) 256:near 115:22:48 84:USGS- 2663:Park 2613:Lake 2598:Hill 1279:1939 1265:Heze 1248:1937 1184:1935 1147:1934 1083:1933 1031:1932 952:1931 890:Bago 882:1930 829:The 813:2012 772:2012 732:2012 710:2012 683:2012 633:2012 606:2012 580:2012 551:2012 518:2024 485:2012 448:2024 240:The 219:6.0 196:Max. 171:Type 123:6.2 86:ANSS 2154:of 1296:Oga 1109:Kos 938:Pyu 672:doi 507:doi 437:doi 248:in 72:ISC 61:UTC 2808:: 1306:†‡ 1269:†‡ 1220:†‡ 1131:†‡ 1058:†‡ 1009:†‡ 903:†‡ 740:^ 670:. 656:79 654:. 650:. 623:. 571:. 526:^ 493:^ 471:. 456:^ 187:, 2144:e 2137:t 2130:v 1355:e 1348:t 1341:v 1322:‡ 1317:† 1291:† 1260:† 1211:† 1202:† 1162:‡ 1159:† 1122:† 1113:† 1104:† 1095:† 1073:† 1043:† 988:† 979:† 964:† 942:† 933:† 912:† 894:† 868:e 861:t 854:v 815:. 774:. 734:. 712:. 685:. 674:: 666:: 635:. 608:. 582:. 553:. 520:. 509:: 487:. 450:. 439:: 223:s 221:M 208:) 127:s 125:M 106:)

Index

1935 Helena earthquake is located in Montana
UTC
ISC
904601
ANSS
ComCat
Ms
46°36′N 112°00′W / 46.6°N 112.0°W / 46.6; -112.0
Strike-slip
Montana
United States
MMI VIII (Severe)
Ms
Montana
epicenter
Helena
surface wave magnitude
Mercalli intensity scale
aftershock
normal faulting
Quaternary
extensional tectonics
Basin and Range province
focal mechanism
strike-slip faulting
Helena Valley

alluvial
Helena High School
Lewis and Clark County Hospital

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