河套地震带中小地震重新定位

Relocation of Small and Medium Earthquakes in Hetao Seismic Belt

摘要: 采用内蒙古地震台网2010年至2022年地震观测报告，选取河套地震带定位地震的震相数据，经过数据检验和筛选后，采用双差定位方法对地震重新定位，获得343个地震的重新定位结果，重新定位后地震在空间和深度上的分布更加收敛，震源深度范围分布在5 km~20 km范围，优势深度分布10 km，震源深度在空间上有差异性，水平方向和垂直方向的定位误差集中分布在0~5 km范围，优势分布在2 km左右。绘制了5个沿纬度的剖面图，揭示不同区域地震在深度上的分布特征，反映了构造的形态，剖面图显示，呼包盆地内部地震深度较边界浅，白彦花盆地剖面图显示多条平行南倾断裂，达拉特旗存在北倾的断裂，呼包盆地呈Y形构造。

Abstract: The seismic observation report of Inner Mongolia Seismological Network from 2010 to 2022 was used and the seismic phase data was selected for the relocation of earthquakes in Hetao seismic zone. After data testing and screening, the double difference positioning method was used to relocate earthquakes, and 343 earthquake results were obtained. After repositioning, the distribution of earthquakes in space and depth was more convergent. The focal depth range was 5~20 km, and the dominant depth was 10 km. The focal depth distribution is different in space. The location errors in horizontal and vertical directions are concentrated in the range of 0~5 km, and the dominant distribution is about 2 km. Five profiles along the latitude were drawn to reveal the distribution characteristics of earthquakes in different regions in depth and reflect the shape of the structure. The profile map shows that the seismic depth in the Hubao basin is shallow than the boundary, the profile map of the Baiyanhua basin shows several parallel south dipping faults, the Dalate banner has a north dipping fault, and the Hubao basin is a Y-line structure.