EGU21-9641
https://doi.org/10.5194/egusphere-egu21-9641
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Spatiotemporal evolution of deep seismicity beneath the central Himalayas

Konstantinos Michailos1, N. Seth Carpenter2, and György Hetényi1
Konstantinos Michailos et al.
  • 1Institute of Earth Sciences, University of Lausanne, 1015 Lausanne, Switzerland
  • 2Kentucky Geological Survey, University of Kentucky, 228 MMRB, Lexington, KY, USA 40506-0107

The Himalayan orogen, formed by the continental collision between the Indian and Eurasian plates, is a unique geological structure that has been extensively studied over the past few decades. These previous studies highlighted the occurrence of earthquakes in the orogen's roots beneath the central Himalayas. However, the characterization of these deep earthquakes remains limited. Here, we compiled a detailed, long-duration catalog, which we use to investigate the spatiotemporal characteristics of seismicity beneath the Himalayan orogen. 

To create this catalog, we collected all available continuous seismic data acquired during the last two decades in the central Himalayas region (i.e., 2001-2005). We applied a systematic, semi-automatic processing routine to obtain absolute earthquake locations using a 1-D velocity model. Using high-quality picks, ~8,000 preliminary earthquake locations have been determined, at least 1,000 of which have hypocentral depths >50 km. We plan to refine the preliminary locations and calculate local magnitudes for the intermediate-depth lithospheric earthquakes. Using this refined catalog, we will analyze the spatiotemporal evolution pattern and properties of the Himalayan deep seismicity. This analysis is expected to provide us with insights into the processes and mechanisms that control seismogenesis beneath the orogen. For example, is seismicity driven by earthquake stress transfer (mainshock-aftershock sequences), or is it caused by external processes like fluids or aseismic slip, or both?

How to cite: Michailos, K., Carpenter, N. S., and Hetényi, G.: Spatiotemporal evolution of deep seismicity beneath the central Himalayas, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-9641, https://doi.org/10.5194/egusphere-egu21-9641, 2021.

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