Passive Seismic Survey Project 

 

Seismotech was awarded the second phase of a passive seismic survey in Assam-Arunanchal Pradesh, in NE India. The area of interest is characterized by very difficult accessibility conditions, due to rainforests or rivers. The exploration areas are also environmentally sensitive because of the wildlife presence.

The data acquisition period for the second phase of the PST survey was commenced in 14th of November 2021 and is currently in progress. Two seismic networks are installed in different blocks and a number of peripheral stations have been placed in order to control the seismicity more effectively (272 3C seismic stations, in total). The flooding effects in Vrahmaputra riverbanks due to monsoons are currently not present and Covid-19 situations is improved, so the acquisition procedure continues without problems.

The scope of the project is to define the seismicity of the area of interest, the tectonic characteristics based on focal mechanisms, and stress variation estimations. Moreover, 3D Vp and Vp/Vs models will be estimated, providing valuable structural and lithological information that can benefit oil exploration program in Assam-Arunanchal Blocks.

The tomographic results of phase-I were very promising. Therefore, we are expecting the processing results of phase-II that will provide robust and more detailed 3D imaging of the areas of interest.