期刊
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
卷 93, 期 3, 页码 1395-1400出版社
SEISMOLOGICAL SOC AMER
DOI: 10.1785/0120020211
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The seismotectonic model in the Sikkim Himalaya does not fit well with the proposed steady state or evolutionary models. The main boundary thrust (MBT) is seismogenic and is a mantle-reaching fault. The earthquakes are not confined to shallower depths (<25 km) above the plane of detachment as proposed in the models, the seismic activity continues from surface to the lower crust (0-45 km) to the north of MBT, and earthquakes are produced by a thrust. mechanism. The earthquakes to the east. of Sikkim, in the Bhutan Himalaya, on the other hand, are produced along a 200-km-long northwest-southeast-trending lineament by transverse tectonics; the seismogenic lineament cuts across the Himalayan major thrusts and extends to the Goalpara wedge in the southeast. The earthquakes occur by strike-slip mechanism in the midcrust, at a depth range of 10-25 km, along this long active lineament.
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