Statistical Evaluation of Spatial-Temporal-Magnitude of Short--Term Aftershock Hazard on a junction of multiple tectonic plates
| Autor: | Zih-Syuan Jian, 簡子軒 |
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| Rok vydání: | 2019 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 107 Taiwan and Japan are located in the junction of multiple tectonic plates where involve complex fault zones. Therefore, there are clustered aftershocks of large earthquakes. In order to assess the risk of aftershock in near-real-time after the main shock, we propose a model with a mixture of bivariate normal distribution to describe the spatial hazard of aftershocks. The spatial hazard function joint with the Reasenberg-Jone (RJ) model then gives a new spatial-temporal-magnitude hazard of aftershocks, denoted by SRJ model. We employ the SRJ model to illustrate two aftershock sequences of, namely, the Mw 7.7 earthquake occurred on September 21, 1999, in Chi-Chi, Taiwan, and Mw 9.0 earthquake occurred on March 11, 2011, in Tohoku-Oki, Japan. The relative aftershock hazard (RAH) maps are constructed based on SRJ model or gridding-RJ method. The effect of RAH maps on depicting possible rupture area of forthcoming large aftershocks is evaluated according to a variety of criteria based on ROC curve and Molchan error diagram. The results finally demostrate that the RAH map based on the SRJ model provides an efficent and better forecast of spatial-temporal magnitude aftershock hazard than the one hazard on gridding--RJ model. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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