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Earthquake swarms near eastern Himalayan Syntaxis along Jiali Fault in Tibet:A seismotectonic appraisal

Geoscience Frontiers 2015年第5期6卷 715-722页

作者： basab mukhopadhyay Sujit Dasgupta Geodata and Database Division Geological Survey of IndiaCentral Headquarters Geological Survey of India

The seismotectonic characteristics of ten repeated earthquake swarm sequence within a seismic cluster along Jiali Fault in eastern Himalayan Syntaxis(EHS) have been *** swarms are spatially disposed in and around Yigong Lake(a natural lake formed by blocking of Yigong River by landslide) and are characterized by low magnitude,crustal events with low to moderate b ***:mb discriminant functions though indicate anomalous nature of the earthquakes within swarm but are considered as natural events that occurred under condition of high apparent stress and stress *** fault plane solutions of selected swarms indicate strike-slip sense of shear on fault planes;solution parameters show low plunging compression and tensional axes along NW-SE and NE-SW respectively with causative fault plane oriented *** steeply towards south or *** fault plane is in excellent agreement with the disposition and tectonic movement registered by right lateral Jiali *** process of pore pressure perturbation and resultant ’r—t plot’ with modelled diffusivity(D = 0.12 m^2/s) relates the diffusion of pore pressure to seismic sequence in a fractured poro-elastic fluid saturated medium at average crustal depth of 15-20 *** low diffusivity depicts a highly fractured interconnected medium that is generated due to high stress activity near the eastern syntaxial bent of *** is proposed that hydro fracturing with respect to periodic pore pressure variations is responsible for generation of swarms in the *** fluid pressure generated due to shearing and infiltrations of surface water within dilated seismogenic fault(Jiali Fault) are causative factors.

关键词： Seismic swarm Eastern Himalayan Syntaxis(EHS) Jial

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Clusters of Moderate Size Earthquakes along Main Central Thrust (MCT) in Himalaya

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International Journal of Geosciences 2011年第3期2卷 318-325页

作者： basab mukhopadhyay 不详

The Main Central Thrust (MCT) in Himalaya is seismically active in segments. In recent times, strain release within these active segments produce five spatial clusters (A to E;Figure 1). The seismicity within the cluster zones occurs in two depth bands;corresponding to the base of upper and lower crust. Depth sections across the clusters illustrate gently dipping subducted Indian Plate, overriding Tibetan Plate and compressed Sedimentary Wedge in between, with mid crustal ramping of MCT. Several presumptions / hypotheses have been put forward to decipher the causes of clustering along MCT. These are segmental activation of MCT, cross fault interactions, zones of arc parallel and arc perpendicular compressions, pore pressure perturbations, low heat flow zones etc. But these hypotheses need to be evaluated in the future after more ground level data are available. The maximum size of seismic threat that MCT can produce is inferred to be around Mw 7.0 in those clusters.

关键词： MCT Himalaya Earthquake Seismic Clusters Seismic Potential

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