Statistical analysis of seismicity in a wide region around the 1998 Mw 8.1 Balleny Islands earthquake in the Antarctic Plate |
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| Authors: | Tetsuto Himeno Masaki Kanao Yosihiko Ogata |
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| Institution: | aTransdisciplinary Research Integration Center, Research Organization of Information and Systems, Kamiyacho Central Place 2F, 4-3-13 Toranomon, Minatoku, Tokyo 105-0001, Japan;bDepartment of Earth Science, National Institute of Polar Research, 10-3 Midoricho, Tachikawa, Tokyo 190-8518, Japan;cThe Institute of Statistical Mathematics, 10-3 Midoricho, Tachikawa, Tokyo 190-8562, Japan |
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| Abstract: | A large earthquake (Mw 8.1) that occurred off the North Coast of the Antarctic continent near the Balleny Islands on 25 March 1998 was the largest intra-plate earthquake ever recorded in the Antarctic Plate. The earthquake hypocenter catalog for this area shows a marked change in seismicity following the main shock in a large area around the Balleny aftershock region. However, the earthquake catalog includes many aftershocks and is affected by a variable detection rate. To overcome these limitations, we applied statistical models and methods, including Gutenberg–Richter’s magnitude frequency distribution, the Epidemic-Type Aftershock Sequences (ETAS) model, and the space–time ETAS model, thereby enabling calculation of the change in detection rate. The results show a change in the spatial pattern of background seismicity over a large region after the 1998 event. |
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| Keywords: | Seismicity Antarctic Plate Balleny earthquake Detection rate ETAS model |
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