Study On Framework Of An Earthquake Alarm Software Research Based On The Earthworm

The technology of earthquake early warning which can give an alert in avery short time after the earthquake happened is taken more and moreseriously because it can achieve the goal of disaster reduction. Research,development, use of the earthquake early warning is already relatively maturein the United States, Japan, Mexico, Turkey and other countries, andcorresponding earthquake early warning system has been built and issuccessfully applied in the real life, which played an important role in the paststrong earthquake. The reseach of earthquake early warning in the Chinesemainland has just started, and it still lags behind the international advancedlevel. The alarm system of Chinses high-speed rail, dams, nuclear plants andother major projects is an improtant part of earthquake early warning, and it isa problem which is urgent need to solve. In general, the research of frameworkof the earthquake alarm software is the core technology of the construction ofthe earthquake alarm system. Based on the open source of Earthworm, theframework of the earthquake alarm software which is suited for significantprojects is studied in this paper. The research mainly includes the followingaspects:1. The needs of the earthquake warning system which is suited for Chinesesignificant projects is analysed by reading the status and development trend ofthe worldwide earthquake early warning system.2. In this paper, using the length of the average ratio method (STA/LTAmethod), linear least squares regression method and the AIC(Akaike’sInformation Criterion) methods, the5.12Wenchuan earthquake strong motionrecords are selected to study on automatic picker of the P wave. Under normalcircumstances, when the accurate arrival time of P wave is picked, an alarmwill be given to the potentially dangerous source region if the peakacceleration is greater than40gal (but also depends on the network transmission delay); under abnormal circumstances, the noise of falsepositives can not be completely ruled out, and further improvement is needed.3. In this paper, the architecture of the Earthworm system and its importantmodules are studied. On this basis, the framework of the earthquake alarmsoftware is proposed.4. Using strong motion records and disturbance events, testing and validationof earthquake disaster prevention and alarm systems is made using theexample of the Beijing-Shijiazhuang-Wuhan High Speed Rail. The resultsshow that this system can give an effective alarm when the seismic wavesarrive, and part of the interference of non-seismic events can also beeffectively removed.