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Mohorovičić discontinuity

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270: 1543: 2652: 2431: 2452: 217: 225: 31: 1532: 2441: 262:(7.6–8.6 km/s). This increase of approximately 1 km/s corresponds to a distinct change in material as the waves pass through the Earth, and is commonly accepted as the lower limit of the Earth's crust. The Moho is characterized by a transition zone of up to 500 meters. Ancient Moho zones are exposed above-ground in numerous 319:
set of waves could only be caused by a sharp transition in density in the Earth's crust, which could account for such a dramatic change in wave velocity. Using velocity data from the earthquake, he was able to calculate the depth of the Moho to be approximately 54 km, which was supported by subsequent seismological studies.
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We may not have made it to our goal of 1300 m, but we did drill the deepest ever single-leg hole into hard rock (789 m), which is currently the 5th deepest ever drilled into the hard ocean crust. We also obtained both the longest (2.85 m) and widest (18 cm) single pieces of hard rock ever recovered
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when he observed two distinct sets of P-waves and S-waves propagating out from the focus of the earthquake. Mohorovičić knew that waves caused by earthquakes travel at velocities proportional to the density of the material carrying them. As a result of this information, he theorized that the second
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and earth science for well over a century. By observing the Moho's refractive nature and how it affects the speed of P-waves, scientists were able to theorize about the earth's composition. These early studies gave rise to modern
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was an attempt to drill to the Moho from deep-ocean regions. After initial success in establishing deep-ocean drilling, the project suffered from political and scientific opposition, mismanagement, and
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Braile, L. W.; Chiangl, C. S. (1986), Barazangi, Muawia; Brown, Larry (eds.), "The continental Mohorovičič Discontinuity: Results from near-vertical and wide-angle seismic reflection studies",
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pursued the goal from 1970 until 1992. They reached a depth of 12,260 metres (40,220 ft), the world's deepest hole, before abandoning the project. One proposal considers a rock-melting
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Korenaga, Jun; Kelemen, Peter B. (1997-12-10). "Origin of gabbro sills in the Moho transition zone of the Oman ophiolite: Implications for magma transport in the oceanic lower crust".
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and may be up to 20 km thick. The Moho may lie well below the crust-mantle boundary and care must be used in interpreting the structure of the crust from seismic data alone.
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As shown in the figure, the Moho maintains a relatively stable average depth of 10 km under the ocean sea floor, but can vary by more than 70 km below continental land masses.
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boundary (the depth at which the mantle becomes significantly ductile). The Mohorovičić discontinuity is 5 to 10 kilometres (3–6 mi) below the
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Godisnje Izvjesce Zagrebackog Meteoroloskog Opservatorija za godinu 1909 - Jahrbuch des Meteorologischen Observatoriums in Zagreb für das Jahr 1909
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Beginning in the 1980s, geologists became aware that the Moho does not always coincide with the crust-mantle boundary defined by composition.
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by the International Ocean Discovery Program and its predecessors! Our hopes are high to return to this site in the not too distant future.
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Ozhovan, M.; F. Gibb; P. Poluektov & E. Emets (August 2005). "Probing of the Interior Layers of the Earth with Self-Sinking Capsules".
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Minshull, T. A.; Muller, M. R.; Robinson, C. J.; White, R. S.; Bickle, M. J. (1998). "Is the oceanic Moho a serpentinization front?".
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The Moho marks the transition in composition between the Earth's crust and the lithospheric mantle. Immediately above the Moho, the
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from the underlying mantle. The Mohorovičić discontinuity was first identified in 1909 by Mohorovičić, when he observed that
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Mohorovičić, A. (1910). "Potres od 8.x.1909; Das Beben vom 8.x.1909" [The earthquake of 8 October 1909].
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is credited with discovering and defining the Moho. In 1909, he was examining data from a local earthquake in
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O'Reilly, Suzanne Y.; Griffin, W.L. (December 2013). "Moho vs crust–mantle boundary: Evolution of an idea".
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Betty Shor, The Scripps Institution of Oceanography, August 1978, 7 pp. Access date 25 June 2019.
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can also increase the depth to the Moho, since serpentinization lowers seismic wave velocities.
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Earth's crust and mantle, Moho discontinuity between bottom of crust and solid uppermost mantle
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Exploring the Earth's Crust – History and Results of Controlled-Source Seismology
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Reaching the discontinuity by drilling remains an important scientific objective.
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Two paths of a P-wave, one direct and one refracted as it crosses the Moho
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needle that can propel itself down to the Moho discontinuity and explore
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of primary seismic waves (P-waves) are consistent with those through
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50 Years of Ocean Discovery: National Science Foundation 1950–2000
268: 223: 134: 254:(6.7–7.2 km/s), and below they are similar to those through 1756: 2471: 1202: 812:, vol. 13, American Geophysical Union, pp. 257–272, 771:"Serpentinization of abyssal peridotites at mid-ocean ridges" 84: 78: 69: 60: 54: 81: 75: 1172:"Digging a Hole in the Ocean: Project Mohole, 1958–1966" 1085:. Horsham: Artemis Press for the Open University Press. 1083:
Understanding the earth: a reader in the earth sciences
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RB Cathcart & MM Ćirković (2006). Viorel Badescu;
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near it and in the upper mantle. The Japanese project
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Pages displaying wikidata descriptions as a fallback
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Mohole, LOCO, CORE, and JOIDES: A brief chronology
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The changing Earth: exploring geology and evolution
63: 57: 51: 1076: 903:. Washington, D.C.: National Academies Press (US). 897:"Scientific Ocean Drilling, from AMSOC to COMPOST" 322:The Moho has played a large role in the fields of 2172:North West Shelf Operational Oceanographic System 141:as they pass through changing densities of rock. 27:Boundary between the Earth's crust and the mantle 728:Geological Society, London, Special Publications 2162:Deep-ocean Assessment and Reporting of Tsunamis 857: 855: 559:(5th ed.). Cengage Learning. p. 216. 125: – is the boundary between the 2483: 1214: 990:"Quest to drill into Earth's mantle restarts" 645:D.P. McKenzie – The Mohorovičić Discontinuity 621:Macro-engineering: a challenge for the future 505:"3.01 – Composition of the Continental Crust" 8: 658:Journal of Geophysical Research: Solid Earth 553:James Stewart Monroe; Reed Wicander (2008). 1194:Map of the Moho depth of the European plate 429: – Strongest part of the Earth's crust 409:, a promising location in the southwestern 2490: 2476: 2468: 1221: 1207: 1199: 862:Prodehl, Claus; Mooney, Walter D. (2012). 498: 496: 1013: 578: 576: 144:The Moho lies almost entirely within the 215: 29: 459: 1493:one-dimensional Saint-Venant equations 1081:. In Gass, I. G.; et al. (eds.). 511:, vol. 3, Pergamon, p. 659, 298:of mantle rock below slowly spreading 113:) – usually called the 108: 7: 2440: 769:Mével, Catherine (September 2003). 2320:National Oceanographic Data Center 1747:World Ocean Circulation Experiment 1635:Global Ocean Data Analysis Project 988:Witze, Alexandra (December 2015). 25: 2167:Global Sea Level Observing System 618:& Roelof D Schuiling (eds.). 405:in late 2015 and to head for the 383:Integrated Ocean Drilling Program 2651: 2650: 2595:D’’ discontinuity (lower mantle) 2590:660 discontinuity (upper mantle) 2585:410 discontinuity (upper mantle) 2450: 2439: 2430: 2429: 1625:Geochemical Ocean Sections Study 1541: 1530: 1152:Britt, Robert Roy (2005-04-07). 1101:"Schlumberger Oilfield Glossary" 1039:"Looking Back on Expedition 360" 503:Rudnick, R. L.; Gao, S. (2003), 343:, and it was cancelled in 1966. 44: 2355:Ocean thermal energy conversion 2078:Vine–Matthews–Morley hypothesis 427:Brittle–ductile transition zone 164:of 35 kilometres (22 mi). 152:does it define the lithosphere– 1078:"The composition of the earth" 1037:Kavanagh, Lucas (2016-01-27). 525:10.1016/b0-08-043751-6/03016-4 177:, the Moho separates both the 1: 748:10.1144/GSL.SP.1998.148.01.05 1615:El Niño–Southern Oscillation 1585:Craik–Leibovich vortex force 1341:Luke's variational principle 1176:National Academy of Sciences 895:Winterer, Edward L. (2000). 471:(in German) (6th ed.). 1128:Beginner's Guide to Geology 713:10.1016/j.tecto.2012.12.031 208:by a high-velocity medium. 167:Named after the pioneering 2708: 2580:Mohorovičić (crust–mantle) 1680:Ocean dynamical thermostat 1528: 1130:. New York: Bounty Books. 844:(in Croatian and German). 795:10.1016/j.crte.2003.08.006 2646: 2425: 2215:Ocean acoustic tomography 2028:Mohorovičić discontinuity 1620:General circulation model 1256:Benjamin–Feir instability 967:10.1007/s10512-005-0246-y 775:Comptes Rendus Geoscience 624:. Springer. p. 169. 40:Mohorovičić discontinuity 2633:Gutenberg (upper mantle) 2614:Regional discontinuities 2345:Ocean surface topography 1720:Thermohaline circulation 1710:Subsurface ocean current 1650:Hydrothermal circulation 1483:Wave–current interaction 1261:Boussinesq approximation 591:Thomas Nelson & Sons 509:Treatise on Geochemistry 236:Gros Morne National Park 110:[moxorôʋiːtʃitɕ] 2382:Sea surface temperature 2365:Outline of oceanography 1560:Atmospheric circulation 1498:shallow water equations 1488:Waves and shallow water 1381:Significant wave height 583:Andrew McLeish (1992). 448:Gutenberg discontinuity 357:Kola Superdeep Borehole 2682:Structure of the Earth 2638:Lehmann (upper mantle) 2573:Global discontinuities 2377:Sea surface microlayer 1742:Wind generated current 616:Richard Brook Cathcart 415:Southwest Indian Ridge 310:Croatian seismologist 274: 243: 221: 35: 2210:Deep scattering layer 2192:World Geodetic System 1700:Princeton Ocean Model 1580:Coriolis–Stokes force 1230:Physical oceanography 467:Mangold, Max (2005). 439:Lehmann discontinuity 388:Plans called for the 363:capsule with a heavy 272: 227: 219: 212:Nature and seismology 33: 2600:Core–mantle boundary 2230:Underwater acoustics 1790:Perigean spring tide 1655:Langmuir circulation 1366:Rossby-gravity waves 664:(B12): 27729–27749. 469:Aussprachewörterbuch 433:Core–mantle boundary 361:radionuclide-powered 334:In the early 1960s, 2687:Croatian inventions 2605:Inner-core boundary 2528:Lithospheric mantle 2392:Science On a Sphere 1998:Convergent boundary 1670:Modular Ocean Model 1630:Geostrophic current 1346:Mild-slope equation 1075:Harris, P. 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1064: 1063: 1029: 980: 961:(2): 556–562. 945: 918: 906: 887: 880: 872:10.1130/mem208 851: 832: 826: 800: 761: 718: 693:Tectonophysics 683: 648: 637: 630: 606: 599: 572: 565: 545: 533: 492: 485: 458: 457: 455: 452: 451: 450: 445: 436: 430: 422: 419: 348: 345: 336:Project Mohole 307: 304: 213: 210: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 2704: 2693: 2692:Earth's crust 2690: 2688: 2685: 2683: 2680: 2678: 2675: 2674: 2672: 2657: 2649: 2648: 2645: 2639: 2636: 2634: 2631: 2627: 2624: 2623: 2622: 2619: 2618: 2616: 2612: 2606: 2603: 2601: 2598: 2596: 2593: 2591: 2588: 2586: 2583: 2581: 2578: 2577: 2575: 2571: 2563: 2560: 2558: 2555: 2554: 2553: 2550: 2545: 2541: 2538: 2534: 2533:Asthenosphere 2531: 2529: 2526: 2525: 2524: 2521: 2520: 2519: 2516: 2514: 2511: 2510: 2508: 2504: 2500: 2493: 2488: 2486: 2481: 2479: 2474: 2473: 2470: 2458: 2453: 2448: 2446: 2438: 2436: 2428: 2427: 2424: 2418: 2415: 2413: 2410: 2408: 2405: 2403: 2400: 2398: 2395: 2393: 2390: 2388: 2385: 2383: 2380: 2378: 2375: 2373: 2370: 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1969: 1966: 1964: 1961: 1959: 1956: 1954: 1951: 1949: 1946: 1944: 1943:Oceanic basin 1941: 1939: 1936: 1934: 1931: 1929: 1926: 1924: 1921: 1919: 1916: 1914: 1911: 1909: 1906: 1904: 1901: 1899: 1896: 1894: 1891: 1889: 1886: 1884: 1881: 1879: 1876: 1874: 1873:Abyssal plain 1871: 1869: 1866: 1865: 1863: 1861: 1857: 1851: 1848: 1846: 1843: 1841: 1838: 1836: 1833: 1831: 1828: 1826: 1823: 1821: 1818: 1816: 1813: 1811: 1808: 1806: 1803: 1801: 1798: 1796: 1793: 1791: 1788: 1786: 1783: 1781: 1780:Internal tide 1778: 1776: 1773: 1771: 1768: 1766: 1763: 1762: 1760: 1758: 1754: 1748: 1745: 1743: 1740: 1738: 1735: 1733: 1730: 1726: 1723: 1722: 1721: 1718: 1716: 1713: 1711: 1708: 1706: 1703: 1701: 1698: 1696: 1693: 1691: 1688: 1686: 1683: 1681: 1678: 1676: 1675:Ocean current 1673: 1671: 1668: 1666: 1663: 1661: 1658: 1656: 1653: 1651: 1648: 1646: 1643: 1641: 1638: 1636: 1633: 1631: 1628: 1626: 1623: 1621: 1618: 1616: 1613: 1611: 1608: 1606: 1603: 1601: 1598: 1596: 1593: 1591: 1588: 1586: 1583: 1581: 1578: 1576: 1573: 1571: 1568: 1566: 1563: 1561: 1558: 1557: 1555: 1553: 1549: 1544: 1533: 1521: 1518: 1517: 1516: 1513: 1511: 1508: 1506: 1503: 1499: 1496: 1494: 1491: 1490: 1489: 1486: 1484: 1481: 1479: 1476: 1474: 1473:Wave shoaling 1471: 1469: 1466: 1464: 1461: 1459: 1456: 1454: 1451: 1449: 1446: 1444: 1441: 1439: 1436: 1434: 1433:Ursell number 1431: 1429: 1426: 1422: 1419: 1418: 1417: 1414: 1412: 1409: 1407: 1404: 1402: 1399: 1397: 1394: 1392: 1389: 1387: 1384: 1382: 1379: 1377: 1374: 1372: 1369: 1367: 1364: 1362: 1359: 1357: 1354: 1352: 1349: 1347: 1344: 1342: 1339: 1337: 1334: 1332: 1329: 1327: 1324: 1322: 1319: 1317: 1316:Internal wave 1314: 1312: 1309: 1307: 1304: 1302: 1299: 1297: 1294: 1292: 1289: 1287: 1284: 1282: 1279: 1277: 1274: 1272: 1269: 1267: 1266:Breaking wave 1264: 1262: 1259: 1257: 1254: 1252: 1249: 1247: 1244: 1243: 1241: 1239: 1235: 1231: 1224: 1219: 1217: 1212: 1210: 1205: 1204: 1201: 1195: 1192: 1182:on 2015-11-02 1181: 1177: 1173: 1169: 1159: 1155: 1150: 1149: 1145: 1139: 1133: 1129: 1125: 1124:Dixon, Dougal 1121: 1111:on 2008-07-17 1110: 1106: 1102: 1098: 1094: 1088: 1084: 1079: 1073: 1072: 1068: 1060: 1049:on 2016-07-09 1048: 1044: 1040: 1033: 1030: 1025: 1021: 1016: 1011: 1007: 1003: 999: 995: 991: 984: 981: 976: 972: 968: 964: 960: 956: 955:Atomic Energy 949: 946: 934: 933: 928: 922: 919: 915: 910: 907: 902: 898: 891: 888: 883: 881:9780813712086 877: 873: 869: 865: 858: 856: 852: 847: 843: 836: 833: 829: 823: 819: 815: 811: 804: 801: 796: 792: 788: 784: 780: 776: 772: 765: 762: 757: 753: 749: 745: 741: 737: 733: 729: 722: 719: 714: 710: 706: 702: 698: 694: 687: 684: 679: 675: 671: 667: 663: 659: 652: 649: 646: 641: 638: 633: 627: 623: 622: 617: 610: 607: 602: 596: 592: 588: 587: 579: 577: 573: 568: 562: 558: 557: 549: 546: 536: 530: 526: 522: 518: 514: 510: 506: 499: 497: 493: 488: 486:9783411040667 482: 478: 474: 470: 463: 460: 453: 449: 446: 440: 437: 434: 431: 428: 425: 424: 420: 418: 416: 412: 408: 407:Atlantis Bank 404: 400: 397:to sail from 396: 395: 391: 386: 384: 380: 379: 374: 373:Chikyu Hakken 370: 366: 362: 358: 354: 346: 344: 342: 341:cost overruns 337: 332: 330: 325: 320: 317: 313: 305: 303: 301: 297: 293: 291: 288: 284: 280: 271: 267: 265: 261: 257: 253: 249: 241: 237: 233: 230: 226: 218: 211: 209: 207: 203: 199: 195: 192: 191:shallow-focus 188: 184: 180: 179:oceanic crust 176: 173: 170: 165: 163: 159: 155: 154:asthenosphere 151: 147: 142: 140: 139:seismic waves 136: 132: 128: 124: 120: 119:Moho boundary 116: 111: 103: 102: 89: 41: 32: 19: 2579: 2540:Lower mantle 2523:Upper mantle 2412:Water column 2360:Oceanography 2335:Observations 2330:Explorations 2300:Marginal sea 2293: 2251:OSTM/Jason-2 2083:Volcanic arc 2058:Slab suction 2027: 1775:Head of tide 1665:Loop Current 1605:Ekman spiral 1391:Stokes drift 1301:Gravity wave 1276:Cnoidal wave 1184:. Retrieved 1180:the original 1161:. Retrieved 1127: 1113:. Retrieved 1109:the original 1105:Schlumberger 1082: 1057: 1051:. Retrieved 1047:the original 1042: 1032: 997: 993: 983: 958: 954: 948: 937:. Retrieved 935:. 2008-08-25 930: 921: 909: 900: 890: 863: 845: 841: 835: 809: 803: 778: 774: 764: 734:(1): 71–80. 731: 727: 721: 696: 692: 686: 661: 657: 651: 640: 620: 609: 585: 555: 548: 538:, retrieved 508: 468: 462: 411:Indian Ocean 392: 387: 376: 350: 333: 321: 309: 294: 276: 245: 240:Newfoundland 172:seismologist 166: 143: 122: 118: 114: 39: 37: 2402:Thermocline 2119:Mesopelagic 2092:Ocean zones 2063:Slab window 1928:Hydrography 1868:Abyssal fan 1835:Tidal range 1825:Tidal power 1820:Tidal force 1705:Rip current 1640:Gulf Stream 1600:Ekman layer 1590:Downwelling 1565:Baroclinity 1552:Circulation 1448:Wave height 1438:Wave action 1421:megatsunami 1401:Stokes wave 1361:Rossby wave 1326:Kelvin wave 1306:Green's law 994:Nature News 699:: 535–546. 477:Dudenverlag 347:Exploration 194:earthquakes 187:seismograms 158:ocean floor 146:lithosphere 101:-vih-chitch 2671:Categories 2562:Inner core 2557:Outer core 2544:Mesosphere 2340:Reanalysis 2239:Satellites 2220:Sofar bomb 2068:Subduction 2043:Ridge push 1938:Ocean bank 1918:Contourite 1845:Tide gauge 1830:Tidal race 1815:Tidal bore 1805:Slack tide 1770:Earth tide 1690:Ocean gyre 1510:Wind setup 1505:Wind fetch 1468:Wave setup 1463:Wave radar 1458:Wave power 1356:Rogue wave 1286:Dispersion 1186:2008-07-17 1163:2008-07-17 1115:2008-07-17 1069:References 1053:2016-09-21 939:2008-08-26 848:(4): 1–63. 540:2019-11-21 390:drill-ship 329:seismology 290:intrusions 264:ophiolites 256:peridotite 248:velocities 229:Ordovician 121:, or just 2202:Acoustics 2154:Sea level 2053:Slab pull 1990:tectonics 1898:Cold seep 1860:Landforms 1737:Whirlpool 1732:Upwelling 1515:Wind wave 1443:Wave base 1371:Sea state 1291:Edge wave 1281:Cross sea 1158:Imaginova 756:128410328 403:Sri Lanka 279:Xenoliths 232:ophiolite 206:refracted 106:Croatian: 2656:Category 2435:Category 2387:Seawater 2114:Littoral 2109:Deep sea 1968:Seamount 1850:Tideline 1795:Rip tide 1725:shutdown 1695:Overflow 1428:Undertow 1271:Clapotis 1126:(2000). 1024:26632566 473:Mannheim 421:See also 385:(IODP). 365:tungsten 287:basaltic 169:Croatian 129:and the 2445:Commons 2315:Mooring 2265:Related 2256:Jason-3 2246:Jason-1 2129:Pelagic 2124:Oceanic 2099:Benthic 1416:Tsunami 1386:Soliton 1002:Bibcode 783:Bibcode 736:Bibcode 701:Bibcode 666:Bibcode 513:Bibcode 413:on the 399:Colombo 324:geology 306:History 283:cratons 202:S-waves 198:P-waves 162:average 2621:Conrad 2518:Mantle 2506:Shells 2134:Photic 1963:Seabed 1376:Seiche 1134:  1089:  1022:  975:918850 973:  878:  824:  754:  628:  597:  563:  531:  483:  378:Chikyū 353:Soviet 316:Zagreb 260:dunite 252:basalt 131:mantle 2542:(aka 2513:Crust 2325:Ocean 2294:Alvin 2144:Swash 1988:Plate 1933:Knoll 1923:Guyot 1878:Atoll 1757:Tides 1520:model 1406:Swell 1238:Waves 971:S2CID 932:Wired 752:S2CID 454:Notes 189:from 135:Earth 127:crust 2552:Core 2292:DSV 2277:Argo 2139:Surf 1595:Eddy 1132:ISBN 1087:ISBN 1020:PMID 876:ISBN 822:ISBN 626:ISBN 595:ISBN 561:ISBN 529:ISBN 481:ISBN 200:and 181:and 123:Moho 97:-hə- 38:The 1010:doi 998:528 963:doi 868:doi 814:doi 791:doi 779:335 744:doi 732:148 709:doi 697:609 674:doi 662:102 521:doi 401:in 258:or 234:in 133:of 99:ROH 95:MOH 2673:: 1174:. 1156:. 1103:. 1056:. 1041:. 1018:. 1008:. 996:. 992:. 969:. 959:99 957:. 929:. 899:. 874:. 866:. 854:^ 820:, 789:. 777:. 773:. 750:. 742:. 730:. 707:. 695:. 672:. 660:. 575:^ 527:, 519:, 495:^ 475:: 331:. 238:, 117:, 104:; 85:tʃ 79:tʃ 70:oʊ 55:oʊ 2546:) 2491:e 2484:t 2477:v 1222:e 1215:t 1208:v 1189:. 1166:. 1140:. 1118:. 1095:. 1026:. 1012:: 1004:: 977:. 965:: 942:. 884:. 870:: 846:9 816:: 797:. 793:: 785:: 758:. 746:: 738:: 715:. 711:: 703:: 680:. 676:: 668:: 634:. 603:. 569:. 523:: 515:: 489:. 88:/ 82:ɪ 76:ɪ 73:v 67:r 64:ˈ 61:ə 58:h 52:m 49:ˌ 46:/ 42:( 20:)

Index

Moho discontinuity

/ˌmhəˈrvɪɪ/
MOH-hə-ROH-vih-chitch
[moxorôʋiːtʃitɕ]
crust
mantle
Earth
seismic waves
lithosphere
mid-ocean ridges
asthenosphere
ocean floor
average
Croatian
seismologist
Andrija Mohorovičić
oceanic crust
continental crust
seismograms
shallow-focus
earthquakes
P-waves
S-waves
refracted


Ordovician
ophiolite
Gros Morne National Park

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