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| 震源参数对断层破裂频率依赖性的影响分析 |
| Analysis of the influence of focal parameters on fault frequency dependence rupture |
| 投稿时间：2025-02-19 修订日期：2025-05-11 |
| DOI： |
| 中文关键词: IDS有限断层反演 反投影 频率依赖性 震源深度 断层倾角 低频滑移 高频能量源 |
| 英文关键词:IDS Finite fault inversion Back projection Frequency Dependence Focal Depth Low-Frequency Slip High-Frequency Energy Sources |
| 基金项目:国家自然科学(51969019,51468045)、2022年度水利部重大科技项目(SKS-2022100)、江西省研究生创新专项(YC2023-s740)。 |
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| 中文摘要: |
| 为探究震源参数——断层倾角和震源深度对Mw6.5~6.9浅源地震断层破裂频率依赖性的影响规律，基于震中相近的俯冲带逆断层地震记录，采用迭代反褶积与叠加有限断层反演法计算断层面低频滑移分布，利用反投影法确定高频能量源分布；通过对比分析水平面上高频能量源和断层面低频滑移分布特征，揭示断层倾角和震源深度对断层破裂频率依赖性影响。研究表明：俯冲带逆断层地震的断层倾角和震源深度对断层破裂频率依赖性均有影响；断层倾角主要影响断层面低频滑移分布，小倾角地震断层面低频滑移分布较集中，大倾角地震低频滑移分布较分散；震源深度则主要影响高频能量源分布，震源较浅地震的高频能量源主要出现在低频滑移区下边缘；随震源深度增加，高频能量源在断层面低频滑移区上、下边缘均有出现。 |
| 英文摘要: |
| To investigate the influence of focal parameters -focal depth and fault dip angle on the frequency dependence of fault rupture in Mw6.5–6.9 shallow earthquakes, based on similar epicenters records of subduction zone reverse fault earthquake, the distribution of low-frequency slip on the fault plane is calculated using an iterative deconvolution and superposition finite fault inversion method, and the distribution of high-frequency energy sources is obtained by back projection method. By comparing the distribution characteristics of high-frequency energy sources on the horizontal plane and low-frequency slip on the fault plane, the influence of focal depth and fault dip angle on the frequency dependence of fault rupture is revealed. The results show that both the dip angle of the fault and the focal depth have an impact on the frequency dependence of earthquake fault rupture for subduction zone thrust fault earthquakes; The fault dip angle affects the low-frequency slip distribution of the fault plane. For low dip earthquakes, the distribution of low-frequency slip on the fault plane is more concentrated, while for high dip earthquakes, the distribution of low-frequency slip on the fault plane is more dispersed. While the focal depth mainly affecting the distribution of high-frequency energy sources; When the earthquake focal is shallow, high-frequency energy sources mainly appear at the lower edge of the low-frequency slip zone. As the increase of focal depth, high-frequency energy sources appear on both the upper and lower edges of the low-frequency slip zone on the fault plane. |
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