Mapping seismic moment and b-value within the continental-collision orogenic-belt region of the Iranian Plateau

详细信息    查看全文

• 作者：S. Mostafa Mousavi ^{smousavi@memphis.edu}
• 刊名：Journal of Geodynamics
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：103
• 期：Complete
• 页码：26-41
• 全文大小：11200 K
• 卷排序：103

文摘

In this paper, high-resolution map of the Gutenberg–Richter b-value and seismic moment-release are provided for the Iranian Plateau using the unified and homogeneous part of the seismicity record of the region (January 1995–July 2016). We use these parameters as stressmeters and qualitatively explore their correlations with the GPS velocity field, strain rate, faulting mechanism, attenuation, and structure of the region. Our goal is to reveal the correlations and anomalous patterns that can help to better understand the seismotectonics and the state of present-day crustal stress within the region. A negative correlation between b-value and seismic moment release as well as convergence rates is found. Correlation between geodetic measurements and seismic observations might indicate the existence of a strong mechanical coupling between the basement and the sediment cover across Zagros. High geodetic strain rates east of the Hormuz strait, southern central Alborz, and along the north Tabriz fault correspond to low b-value anomalies at these areas. A strong low b-value anomaly is observed at the major tectonic discontinuity between the Zagros continental collision and the oceanic Makran subduction.