A GIS-based time-dependent seismic source modeling of Northern Iran
详细信息 查看全文
- 作者：Mahdi Hashemi ; Ali Asghar Alesheikh…
- 关键词：seismic source modeling ; geostatistical index ; seismic hazard ; GIS
- 刊名：Earthquake Engineering and Engineering Vibration
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：16
- 期：1
- 页码：33-45
- 全文大小：
- 刊物类别：Engineering
- 刊物主题：Geotechnical Engineering & Applied Earth Sciences; Civil Engineering; Vibration, Dynamical Systems, Control;
- 出版者：Institute of Engineering Mechanics, China Earthquake Administration
- ISSN：1993-503X
- 卷排序：16
文摘
The first step in any seismic hazard study is the definition of seismogenic sources and the estimation of magnitude-frequency relationships for each source. There is as yet no standard methodology for source modeling and many researchers have worked on this topic. This study is an effort to define linear and area seismic sources for Northern Iran. The linear or fault sources are developed based on tectonic features and characteristic earthquakes while the area sources are developed based on spatial distribution of small to moderate earthquakes. Time-dependent recurrence relationships are developed for fault sources using renewal approach while time-independent frequency-magnitude relationships are proposed for area sources based on Poisson process. GIS functionalities are used in this study to introduce and incorporate spatial-temporal and geostatistical indices in delineating area seismic sources. The proposed methodology is used to model seismic sources for an area of about 500 by 400 square kilometers around Tehran. Previous researches and reports are studied to compile an earthquake/fault catalog that is as complete as possible. All events are transformed to uniform magnitude scale; duplicate events and dependent shocks are removed. Completeness and time distribution of the compiled catalog is taken into account. The proposed area and linear seismic sources in conjunction with defined recurrence relationships can be used to develop time-dependent probabilistic seismic hazard analysis of Northern Iran.