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Two-dimensional Lg wave Q value tomographic imaging method based on single station data, double station data and double event data

A tomographic imaging and dual-event technology, applied in seismic signal processing, etc., can solve the problems of inability to use Lg wave body wave magnitude measurement and low resolution

Active Publication Date: 2015-03-25
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

The existing Lg-wave Q value distribution images in the Eurasian continent have a very low resolution, especially in areas where the station distribution is relatively sparse, which cannot be used for high-precision Lg-wave body wave magnitude determination

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  • Two-dimensional Lg wave Q value tomographic imaging method based on single station data, double station data and double event data
  • Two-dimensional Lg wave Q value tomographic imaging method based on single station data, double station data and double event data
  • Two-dimensional Lg wave Q value tomographic imaging method based on single station data, double station data and double event data

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Embodiment Construction

[0024] 1. Regional earthquake data

[0025] From October 1995 to August 2007, 1720 broadband vertical component digital seismograms were recorded at 20 stations for 125 regional events that occurred in Northeast China and adjacent areas. These data are used for Lg wave Q-value imaging, and their corresponding station codes and locations are listed in Table 3-1. 9 stations, MDJ, INCN, BJT, HIA, YAK, TLY, ULN, YSS and MAJO, belong to The Global Seismic Network (GSN) is under the jurisdiction of the United States Geological Survey (USGS) and the International Seismological Union (IRIS). The other 11 stations are stations of the China National Digital Seismic Network (CNDSN). Under the jurisdiction of the Network Center (CENC). Both GSN and CNDSN stations are equipped with broadband instruments, which have flat velocity instrument response curves within the bandwidth of 0.03 to 8.0 Hz, and the sampling interval is 20, 40 or 50s-1. Table 3-2 lists the parameters of the event. Th...

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Abstract

The invention discloses a two-dimensional Lg wave Q value tomographic imaging method based on single station data, double station data and double event data. The method comprises the following steps that (a) regional seismic data are collected and preprocessed so that Lg wave true amplitude and a signal to noise ratio can be obtained, the threshold value of the signal to noise ratio is set, and an Lg spectral data body used for Lg wave Q value tomographic imaging is selected; (b) the double station data and the double event data are extracted from the single station data; (c) Lg wave Q value tomographic imaging is performed based on amplitude data. Northeast China adjoins North Korea, and tomographic imaging results for the northeast China can be used for accurately measuring the body wave magnitude of nuclear explosions in North Korea and accurately estimating the yield of nuclear explosions. In addition, northeast China is rich in oil gas, mineral and hydrotherm resources, the resources have a certain corresponding relation with a crustal Q value; the interchange of materials between the earth crust and the upper mantle has intense influence on earth crust attenuation; conversely, lithosphere thinning in east China can be further studied by utilizing a Q value imaging model.

Description

technical field [0001] The invention relates to a seismic Lg wave Q value measurement technology, in particular to a two-dimensional Lg wave Q value tomographic imaging method based on single station, double station and double event data. It can be applied to underground nuclear explosion seismological monitoring. Background technique [0002] In recent years, some countries in my country's surrounding areas, such as India, Pakistan, and North Korea, have conducted underground nuclear tests one after another. The distance from these test areas to my country's seismic network is within the range of regional earthquakes. Although the equivalents of nuclear tests in these countries are relatively small, they can still stimulate Lg waves that can be clearly observed. Using seismic records to quickly identify underground nuclear explosion events and accurately determine their explosive equivalent is of great significance to our country's homeland security. Accurately estimatin...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 赵连峰
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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