Abstract

The impact crater formation on the surface of the Earth and other planetary bodies is accompanied by the action of shock waves on rocks and their displacement into a new position. The shock-wave compression results in the occurrence of the remanent heating of rocks (up to melting and evaporation during the unloading). The direct mechanical action of the shock compression and the remanent heating change the magnetic properties and magnetization, which leads to arising of the magnetic anomaly above the crater area. This work presents an example of the complex analysis of the magnetic anomaly above the well-studied impact crater Bosumtwi (Ghana, a diameter of about 10 km), including the numerical simulation of the crater formation process and the magnetic anomaly model on the basis of simulated parameters of shock compression. The complex model demonstrates a good agreement with data of direct measurements.

中文翻译：

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以Bosumtwi陨石坑为例，模拟与复杂陨石坑相关的磁异常

摘要

在地球和其他行星表面的撞击坑形成时，伴随着冲击波在岩石上的作用及其位移到新的位置。冲击波压缩会导致剩余的岩石加热（在卸载过程中达到融化和蒸发）。冲击压缩和剩余热量的直接机械作用会改变磁性能和磁化强度，从而导致在火山口区域上方出现磁异常。这项工作提供了对经过充分研究的撞击坑Bosumtwi（加纳，直径约10 km）上方的磁异常进行复杂分析的示例，其中包括对陨石坑形成过程的数值模拟以及基于冲击压缩的模拟参数。