Impact of Ambiguity of Physical Properties of Three-Dimensional Crustal Structure Model on Coseismic Slip and Interseismic Slip Deficit in the Nankai Trough Region
Since huge earthquakes are expected along plate subduction zones such as the Japan Trench and Nankai Trough, the estimation of coseismic slip and interseismic slip deficit is essential for immediate response and preliminary measures to reduce damage. Recently, analysis considering the complex topogr...
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| Format: | Article |
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MDPI AG
2022-04-01
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| Series: | GeoHazards |
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| Online Access: | https://www.mdpi.com/2624-795X/3/2/9 |
| _version_ | 1797487010099757056 |
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| author | Sota Murakami Tsuyoshi Ichimura Kohei Fujita Takane Hori Yusaku Ohta |
| author_facet | Sota Murakami Tsuyoshi Ichimura Kohei Fujita Takane Hori Yusaku Ohta |
| author_sort | Sota Murakami |
| collection | DOAJ |
| description | Since huge earthquakes are expected along plate subduction zones such as the Japan Trench and Nankai Trough, the estimation of coseismic slip and interseismic slip deficit is essential for immediate response and preliminary measures to reduce damage. Recently, analysis considering the complex topography and underground structure of the plate subduction zone has been performed for improving the estimation performance. However, the three-dimensional (3D) crustal structural model needs to be improved continuously. In this paper, we obtained Green’s functions for 3D crustal structural models with ambiguity by 3D crustal deformation analysis, and the coseismic slip and interseismic slip deficit were estimated. Here we enabled the calculation of many Green’s functions with different physical properties of the 3D crustal structure by utilizing a GPU-based 3D crustal deformation analysis method that significantly reduces the analysis cost. The physical properties on the upper plate’s side, which are located above the plate boundary fault, were changed. We found no significant difference in the estimation performance, except for the upper crust, which most of the fault slip area is in contact with, in the case of coseismic slip estimation. In contrast, the coseismic slip estimation when the properties of the upper crust was changed had a significant error, and a negative slip was estimated at the deep part of the plate boundary where no slip was originally given. |
| first_indexed | 2024-03-09T23:42:33Z |
| format | Article |
| id | doaj.art-13794e0a078f49308eeec2f8c9faebcc |
| institution | Directory Open Access Journal |
| issn | 2624-795X |
| language | English |
| last_indexed | 2024-03-09T23:42:33Z |
| publishDate | 2022-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | GeoHazards |
| spelling | doaj.art-13794e0a078f49308eeec2f8c9faebcc2023-11-23T16:49:22ZengMDPI AGGeoHazards2624-795X2022-04-013216217710.3390/geohazards3020009Impact of Ambiguity of Physical Properties of Three-Dimensional Crustal Structure Model on Coseismic Slip and Interseismic Slip Deficit in the Nankai Trough RegionSota Murakami0Tsuyoshi Ichimura1Kohei Fujita2Takane Hori3Yusaku Ohta4Earthquake Research Institute and Department of Civil Engineering, The University of Tokyo, Bunkyo, Tokyo 113-0032, JapanEarthquake Research Institute and Department of Civil Engineering, The University of Tokyo, Bunkyo, Tokyo 113-0032, JapanEarthquake Research Institute and Department of Civil Engineering, The University of Tokyo, Bunkyo, Tokyo 113-0032, JapanR&D Center for Earthquake and Tsunami, Japan Agency for Marine-Earth Science and Technology, Yokosuka 237-0061, JapanResearch Center for Prediction of Earthquakes and Forecasting Volcanic Eruptions, Graduate School of Science, Tohoku University, Sendai 980-8576, JapanSince huge earthquakes are expected along plate subduction zones such as the Japan Trench and Nankai Trough, the estimation of coseismic slip and interseismic slip deficit is essential for immediate response and preliminary measures to reduce damage. Recently, analysis considering the complex topography and underground structure of the plate subduction zone has been performed for improving the estimation performance. However, the three-dimensional (3D) crustal structural model needs to be improved continuously. In this paper, we obtained Green’s functions for 3D crustal structural models with ambiguity by 3D crustal deformation analysis, and the coseismic slip and interseismic slip deficit were estimated. Here we enabled the calculation of many Green’s functions with different physical properties of the 3D crustal structure by utilizing a GPU-based 3D crustal deformation analysis method that significantly reduces the analysis cost. The physical properties on the upper plate’s side, which are located above the plate boundary fault, were changed. We found no significant difference in the estimation performance, except for the upper crust, which most of the fault slip area is in contact with, in the case of coseismic slip estimation. In contrast, the coseismic slip estimation when the properties of the upper crust was changed had a significant error, and a negative slip was estimated at the deep part of the plate boundary where no slip was originally given.https://www.mdpi.com/2624-795X/3/2/9finite element methodgeodetic inversionOpenACC |
| spellingShingle | Sota Murakami Tsuyoshi Ichimura Kohei Fujita Takane Hori Yusaku Ohta Impact of Ambiguity of Physical Properties of Three-Dimensional Crustal Structure Model on Coseismic Slip and Interseismic Slip Deficit in the Nankai Trough Region GeoHazards finite element method geodetic inversion OpenACC |
| title | Impact of Ambiguity of Physical Properties of Three-Dimensional Crustal Structure Model on Coseismic Slip and Interseismic Slip Deficit in the Nankai Trough Region |
| title_full | Impact of Ambiguity of Physical Properties of Three-Dimensional Crustal Structure Model on Coseismic Slip and Interseismic Slip Deficit in the Nankai Trough Region |
| title_fullStr | Impact of Ambiguity of Physical Properties of Three-Dimensional Crustal Structure Model on Coseismic Slip and Interseismic Slip Deficit in the Nankai Trough Region |
| title_full_unstemmed | Impact of Ambiguity of Physical Properties of Three-Dimensional Crustal Structure Model on Coseismic Slip and Interseismic Slip Deficit in the Nankai Trough Region |
| title_short | Impact of Ambiguity of Physical Properties of Three-Dimensional Crustal Structure Model on Coseismic Slip and Interseismic Slip Deficit in the Nankai Trough Region |
| title_sort | impact of ambiguity of physical properties of three dimensional crustal structure model on coseismic slip and interseismic slip deficit in the nankai trough region |
| topic | finite element method geodetic inversion OpenACC |
| url | https://www.mdpi.com/2624-795X/3/2/9 |
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