Preliminary results of seismicity around the Jang Bogo Station in Antarctica: induced by ice stream and volcanic activities

The Korea Polar Seismic Network (KPSN) was installed with 4 broadband seismometers in 2011 around Mt. Melbourne, located in Northern Victoria Land, Antarctica, ~30 km North of the Jang Bogo station (JBG). The KPSN was extended to the David Glacier with 7 broadband seismometers to the South. Currently, the KPSN consists of 21 broadband seismic stations, including the seismic station at the JBG, and covers the David Glacier from South to Mt. Rittmann and Coulman Island to North.

The Extreme Geoscience Group (EGG) at the Korea Polar Research Institute (KOPRI) has been developing a local earthquake catalog utilizing continuous seismic data from the KPSN, particularly focusing on data recorded since 2016, as the network achieved stable recordings post-2017. To compile this catalog, the team employed the 'scautopick' module of SeisComP, utilizing a Short-Term Average/Long-Term Average (STA/LTA) detector within the 0.7 to 2 Hz frequency range to identify P-wave arrivals. Following initial detections, a secondary picker was applied for S-waves using the 'spicker' module. This methodology led to the identification of over 3,900 local seismic events from the 2016 and 2017 data. Event locations were determined using the NonLinLoc software with the "ISAP91" velocity model, and subsequent relocations were performed using the hypoDD algorithm.

The detected events predominantly cluster into two groups: one in the upstream region of the David Glacier (1,370 events) and another around the Mt. Melbourne area (858 events). Current research is focused on understanding the factors influencing seismicity changes in the David Glacier region, considering variables such as air temperature fluctuations, tidal movements, the glacier's geometric structure, etc. The results are preliminary; efforts are underway to extend the earthquake catalog up to 2024 and to conduct detailed studies on the focal parameters and mechanisms of the recorded events.