使用GRACE数据的地震高风险区可视化标识方法

Research on a Method for Identifying High Risk Areas of Earthquakes Based on GRACE Gravity Data

利用GRACE时变重力场数据,根据强震发生之前的重力变化异常规律,结合GIS强大的空间分析和地理信息可视化,确定了一种多危险级别的地震高风险区标识方法。其主要包括提取重力变化零等值线、提取重力变化高梯度区、识别高发震率的断层、不同危险级别的地震高风险区标识等4个步骤。并使用2015年全球震级6.0以上的地震对标识结果进行检验,发现使用5年时间尺度的重力变化异常数据,生成地震高风险标识图,来预测最接近重力变化时间的地震发生情况,预测的准确率最高。

According to GRACE time-variable gravity field data,the regulation of gravity change before earthquakes and GIS spatial analysis and geographic information visualization method,this article first puts forward a model to identify how dangerous a high level of seismic risk area is.It includes the following four steps:Extraction of the zero gravity change contour lines;Extraction of gravity-change gradient area;Identification of high risk faults;Identification of different risk levels of high earthquake risk area.Then the abnormal gravity data of a 5-year time scale is used to test this model and the identification map of high earthquake risk area is generated to predict the earthquake one year later after the gravity variation.The test shows that this model has a high prediction accuracy.