Determining the depth of medium and small earthquakes in Hainan using the first arrival P seismic phase combined with depth sPL seismic phase
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摘要: 两种测定中小地震震源深度的方法：一是基于走时测定震源深度，二是基于波形测定震源深度。以海南地区4次中小地震为例，采用初至P震相联合深度震相sPL测定震源深度的方法，测定其结果为11—12 km，结果一致性较好，表明两种方法适合用于测定中小地震的震源深度。Abstract: There are two kinds of focal depth measurement method for medium and small earthquake, the first is to use arrive time, and the second is to use waveform. Taking 4 small and medium earthquakes in Hainan as an example, the method of measuring the focal depth using the first arrival P phase combined with the deep phase sPL was used to measure the result between 11 km and 12 km. The results show good agreement indicating that the two methods are suitable for determining the focal depth of small and medium earthquakes.
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Key words:
- first arrival P phase /
- sPL /
- focal depth /
- PTD /
- phase
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图 3 地壳内各Pn、Pg组合搜索出的震源深度图
Figure 3. Focal depth maps based on combination of Pn and Pg seismic phases in the crust
图 4 sPL震相的确定和测定深度结果图
（a）、（b）、（c）、（d）分别为事件1、事件2、事件3、事件4 sPL震相的确定和测定深度结果图
Figure 4. Determination of sPL phase and depth
（a）,（b）,（c）,（d）represent the sPL phase of event 1, event 2, event 3 and event 4 and the corresponding measured depths
表 1 地震事件
Table 1. Earthquake event
发震时刻（年-月-日 时:分） 震级（ML） 地点 事件1 2018-07-30 17:10 3.7 海南保亭 事件2 2019-04-15 06:11 2.8 海南陵水 事件3 2019-08-20 10:48 3.3 海南三亚 事件4 2019-08-20 19:17 4.2 海南三亚 
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