ZS (2022-2022): Subduction below extreme sedimentation: A multidisciplinary transect from the Ganges-Brahmaputra Delta to the IndoBurma Backarc

• Columbia University

We will utilize four broadband and four long-period MT instruments to collect data at approximately 30 sites over a four week field campaign in Bangladesh. The broadband instruments will be loaned to us separately by Kerry Key, and the long-period instruments are being requested from PASSCAL here. We expect to deploy ~23 stations on an approximately E-W line along an existing and ongoing seismic experiment (NSF-EAR 17-14892). The profile will be up to 200 km long. Most stations will be ~10 km apart and a segment, where the seismic stations are also more closely spaced, will have spacing of 5 km. The N-S line will cross the profile at Srimongal and extend between the Bangladeshi border with India’s Tripura state in the south and Meghalaya state in the north. We are planning for 20 km station spacing on the N-S line with 10 km spacing for the last few sites in the north for a total of ~7 stations. We will also deploy one long-period station at a fixed site for the duration of the experiment in a low-noise environment. This will provide a continuous remote-reference site for high-quality data processing purposes. It will likely be located near the crossing of the two lines in Srimongal. The broadband instruments will be deployed for an average of 3-4 days per station to obtain frequencies down to 0.001 Hz or better. The long-period instruments will be deployed for 5-7 days per station and extend data coverage to lower frequencies in order to image the lithosphere. With two field teams, we expect to be able to deploy 1-2 sites per day. Deployment of the 30 stations will take approximately 24 days beginning end of April or early May 2021. Bangladesh has a predominantly hot, tropical climate. The timing of the experiment is just prior to the start of the monsoon season (June-October). The weather in May is typically hot and humid with average daytime highs exceeding 90 degF. Thunderstorms accompanied by moderate to heavy rainfall are common. Therefore, we request waterproof cases and lightning protection kits for the MT instruments. We request the PASSCAL instruments be shipped to Columbia University. We will carry these instruments as excess baggage on our flights to/from Bangladesh.

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