包含断层倾角和成震厚度效应的地壳地震新经验震源尺度法

IF 2.6 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Jyun‐Yan Huang, Norman A. Abrahamson, Chih‐Hsuan Sung, Shu‐Hsien Chao
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引用次数: 0

摘要

利用有限断层破裂模型的全球数据集,得出了包括宽度限制效应和可能的自由表面效应在内的地壳地震长宽比和破裂面积的新的全球震源缩放关系。与常用的力矩震级(M)、断层长度(L)、宽度(W)和面积之间的比例关系不同,我们通过将 M 与高宽比(L/W)和断层面积联系起来,建立了自洽的比例关系,以模拟一旦破裂宽度达到断层下倾宽度极限时高宽比的变化。大震级地震的宽度限制效应取决于断层倾角和区域性成震厚度。纵横比的震级缩放包括与倾角有关的震级缩放断裂。震级-面积关系中这种与倾角相关的震级缩放关系是通过一个包含与倾角相关的过渡范围的三线关系来模拟的。使用归一化深度项和以断层破裂顶部深度为参数的震源,可以观察到自由表面的影响;这在面积缩放关系中更为明显。缩放差异与断层的几何形状有关,而不是像通常假设的那样与倾斜角有关。最后,通过将面积和长宽比模型转换为 L 和 W 模型而得到的相应 L 和 W 缩放关系不仅在平均水平上与之前的区域缩放规律显示出良好的一致性,而且由于包含了特定断层的倾角和震源厚度,还提供了更好的特定断层应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
New Empirical Source‐Scaling Laws for Crustal Earthquakes Incorporating Fault Dip and Seismogenic‐Thickness Effects
New global source‐scaling relations for the aspect ratio and rupture area for crustal earthquakes that include the width‐limited effect and a possible free‐surface effect are derived using a global dataset of finite‐fault rupture models. In contrast to the commonly used scaling relations between moment magnitude (M), fault length (L), width (W), and area, we built self‐consistent scaling relations by relating M to the aspect ratio (L/W) and to the fault area to model the change in the aspect ratio once the rupture width reaches the down‐dip width limit of the fault. The width‐limited effect of large‐magnitude earthquakes depends on the fault dip and a regional term for the seismogenic thickness. The magnitude scaling of the aspect ratio includes a break in the magnitude scaling that is dip angle dependent. This dip angle‐dependent magnitude scaling in the magnitude–area relation is modeled by a trilinear relation incorporating a dip‐related transition range. The effect of the free surface was observed using a normalized depth term and parameterizing the source by the depth of the top of the fault rupture; it is more apparent in the area scaling relation. The scaling differences are related to the fault geometry, not to the rake angle, as commonly assumed. Finally, the corresponding L and W scaling relations obtained by converting the area and aspect ratio models to L and W models not only show good agreement with the previous regional scaling laws on average but also provide better fault‐specific application due to the inclusion of a fault‐specific dip angle and seismogenic thickness.
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来源期刊
Seismological Research Letters
Seismological Research Letters 地学-地球化学与地球物理
CiteScore
6.60
自引率
12.10%
发文量
239
审稿时长
3 months
期刊介绍: Information not localized
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