BROADBAND SOURCE MODEL OF THE 2021 FUKUSHIMA-KEN OKI EARTHQUAKE USING STRONG MOTION RECORDS AT SEAFLOOR AND LAND

The author has estimated a broadband source model of the 2021 Fukushima-ken oki earthquake (MJ7.3) using S-net and KiKnet strong motion records by the empirical Green's function method. Three strong motion generation areas (SMGAs) with very high stress drop are estimated around the edge of the fault. One SMGA is located at shallow area in oceanic crust. The other two SMGAs are located at deep area where slip estimated by previous source models without using S-net is small. The two SMGAs at deep area make a larger contribution to strong motions at S-net than those at most of KiK-net. © 2022 Architectural Institute of Japan. All rights reserved.