华南地震2026，Vol.46Issue(2)：22-28,7.DOI:10.13512/j.hndz.2026.02.03
基于波数域Parker-Oldenburg方法计算泸定震区莫霍面深度
Calculation of Moho Depth in Luding Seismic Zone Based on Parker-Oldenburg Method in Wavenumber Domain
摘要
Abstract
As the crust-mantle interface,the fine-scale structure of the Moho discontinuity provides critical in-sights into deep crustal material migration and tectonic evolutionary mechanisms.Based on the WGM2012 global gravity model data,this study used the fourth-order wavelet multi-scale decomposition technique to extract the re-gional gravity anomalies in the Luding seiamic zone(22°-36°N,96°-108°E).Through the Parker-Oldenburg it-erative inversion algorithm in the wavenumber domain,a high-resolution Moho depth model in the study area was constructed,and the seismogenic mechanism of the Luding M6.8 earthquake in 2022 was discussed in combination with the tectonic dynamics background.The results show that marked lateral heterogeneity of the Moho discontinuity(27-76 km),with a steep transitional zone(14-30 km vertical offset)between the Sichuan Basin(36-42 km)and the Songpan-Garzê block(60-72 km).There is a certain spatial correlation between major tectonic boundaries(e.g.,Longmenshan fault zone and Anninghe fault zone)and Moho gradient zone,exhibiting mirroring features with grav-ity anomaly gradient zones.The epicenter of the Luding earthquake is located at the intersection of the Xianshuihe fault zone and the Moho gradient zone,where synergistic interaction between deep vertical material migration and tectonic stress fields likely acted as the key dynamic trigger.This research offers novel geophysical constraints on deep structural evolution along the eastern margin of the Qinghai-Tibet Plateau.关键词
Parker-Oldenburg反演方法/泸定6.8级地震/地震区/莫霍面不连续性Key words
Parker-Oldenburg inversion method/Luding M6.8 earthquake/Seismic zone/Moho discontinuity分类
天文与地球科学引用本文复制引用
申宇彤,杨光亮,申重阳..基于波数域Parker-Oldenburg方法计算泸定震区莫霍面深度[J].华南地震,2026,46(2):22-28,7.基金项目
国家自然科学基金(42174104,42374105) （42174104,42374105）
科技部科技基础资源调查专项(2023FY10150502)联合资助. （2023FY10150502）
