Near-real time earthquake source position positioning method

A positioning method and near-real-time technology, applied in seismology, seismic signal processing, measuring devices, etc., can solve problems such as low information utilization, poor timeliness, and single method

Inactive Publication Date: 2016-07-13
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0004] Judging from the current positioning method, it is mainly based on partial arrival information, the method is relatively s

Method used

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  • Near-real time earthquake source position positioning method
  • Near-real time earthquake source position positioning method
  • Near-real time earthquake source position positioning method

Examples

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Embodiment

[0046] Example: Taking a 3.8-magnitude earthquake in Japan on April 23, 2015 as an example, according to the P wave information of three stations, the location of the earthquake source is located and compared with the actual information. Such as figure 2 As shown, the specific operation steps are as follows:

[0047] Step 1: After the earthquake, open the seismic acceleration records of the first three seismic stations that first obtained the P wave arrival time, and read the station numbers AOM0051504232215, AOM0041504232215, AOM0201504232215, and geographical coordinates (Lat1, Long1), (Lat2, Long2), (Lat3, Long3)), identify the arrival time of P wave (Time1, Time2), calculate the arrival time difference in pairs, and convert the latitude and longitude coordinate data of the seismic station into plane Cartesian coordinates (x11, x12), (x21, x22), (x31, x32);

[0048] Step 2: For any two stations, assuming that the S1 coordinates of one station are (x11, y12), the arrival ...

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Abstract

The invention discloses a near-real time earthquake source position positioning method. The method comprises the following steps: after an earthquake happens, numbers and geographical coordinates of three stations firstly acquiring P wave arrival time are read, the P wave arrival time is recognized, arrival time differences are solved pairwisely, and latitude and longitude coordinate data of earthquake stations are subjected to projection transformation and converted into plane rectangular coordinates; as for any two stations, hyperbolic curves meeting the arrival time differences are drawn, the epicenter is close to the one of the early-arrival station, and any two of the three hyperbolic curves are intersected; according to a triangle formed by coordinates of the intersected points, the gravity center of the triangle is calculated, and the coordinates of the gravity center are the initial value of the epicenter position; the earthquake source position is revised further; variable reduction processing is carried out on an observation equation and an index function; a partial derivative is solved until the requirements are met; and the final calculation result is converted into geographic coordinates, and the coordinates are the final result. Through eliminating errors for the epicenter azimuth and earthquake magnitude estimation, the earthquake positioning precision and the positioning speed are improved.

Description

technical field [0001] The invention relates to a method for locating seismic source positions, in particular to a method for locating near real-time seismic source positions by only using the P-wave arrival information of the first three stations in a seismic network. Background technique [0002] Earthquake location is a basic problem in seismology, and its main task is to accurately determine the location of the epicenter (epicenter location and focal depth) and the moment of the earthquake. In earthquake early warning, fast and reliable positioning information is also the primary issue that determines the success or failure of early warning for potentially destructive major earthquakes. As the earthquake early warning of the super earthquake rapid report, due to the requirement of timeliness, it is necessary to obtain the earthquake location quickly and reliably. However, the traditional earthquake location method currently used needs more seismic phase arrival informat...

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/307
Inventor 张建经唐雅蕾
Owner SOUTHWEST JIAOTONG UNIV
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