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A Method for Realizing Earthquake Early Warning

An earthquake early warning and earthquake technology, applied in seismic signal processing and other directions, can solve the problems of large error in picking up p-waves and low anti-interference ability, and achieve the effect of eliminating false triggers, enhancing anti-interference ability and fast calculation speed.

Inactive Publication Date: 2018-11-30
LIAONING TECHNICAL UNIVERSITY
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  • Claims
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Problems solved by technology

Earthquake early warning requires fast pick-up speed of p-wave, and only the long-short time-average ratio method can meet the fast requirement, but its low anti-interference ability makes the problem of large arrival time error of picking up p-wave need to be improved

Method used

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  • A Method for Realizing Earthquake Early Warning
  • A Method for Realizing Earthquake Early Warning
  • A Method for Realizing Earthquake Early Warning

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Embodiment Construction

[0041] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0042] A method for realizing earthquake early warning, such as figure 1 As shown, the method of this embodiment is as follows.

[0043] Step 1: Real-time extraction of three-component earthquake records{x i}, {y i},{z i}, i is the real-time record serial number of the ground motion record; the three-component ground motion record is displacement, velocity or acceleration. In this embodiment, the three-component ground motion record adopts acceleration, and the unit is cms -2 .

[0044] like figure 2 As shown, it is the ground pulsation signal applied 3 s before the arrival of the seismic wave in this embodiment, and the amplitude of the ground pulsation signal is ...

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Abstract

The invention provides a method for implementing earthquake early warning, and relates to the technical field of seismic signal processing. The method comprises the steps of firstly recording seismic waves in real time, performing real-time filtering on the real-time transmitted seismic wave data through a low-pass filter, taking the amplitude relative change rate as a characteristic function, calculating the characteristic function for the real-time filtered data, determining the lengths of long and short scales, synchronously moving long and short windows according to the determined step lengths, calculating an STA / LTA value for the characteristic function in real time at the same time, judging whether the STA / LTA value exceeds a threshold thereof or not, if so, taking the corresponding sampling time as the seismic wave arrival time and triggering an earthquake early warning device at the same time, and if not, continuing to perform the next time of seismic wave real-time recording. According to the invention, the p-wave arrival time is automatically picked up by adopting a long and short time mean ratio method, the algorithm is simple, the calculation speed is high, the amplitude relative change rate of the seismic waves is used as the characteristic function, the used machine hour can be ignored, and the anti-interference ability is strong.

Description

technical field [0001] The invention relates to the technical field of earthquake engineering and earthquake signal processing, in particular to a method for realizing early warning of earthquakes. Background technique [0002] Earthquake early warning is an earthquake time early warning method aimed at the lack of earthquake prediction ability. The general principle is that the seismic detector is placed near the active fault. When an earthquake occurs, because the p-wave travels faster than the s-wave, the seismic detector first receives the p-wave and uses it before the destructive s-wave arrives. Electromagnetic waves transmit earthquake news to the city, informing people to prepare for emergency before the arrival of the earthquake s wave. The rapid development of earthquake early warning technology in recent years requires automatic, rapid and accurate determination of the arrival time of P waves. [0003] Seismic p-wave automatic picking methods have been continuous...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
CPCG01V1/30
Inventor 李启成
Owner LIAONING TECHNICAL UNIVERSITY
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