Research On Specification System Of Seismometers And Design Of MEMS Accelerograph

Earthquake early warning systems and rapid intensity report systemsreceive more and more attention and are developed in the counties that haveearthquakes frequently. Countries like Japan, USA, Mexico, Turkey, Rumaniaand Chinese Taiwan province have developed or are developing their rapidintensity report system, among these countries and areas, Japan, Mexico andTurkey have their systems working while USA, Rumania and Chinese Taiwanprovince are evaluating their rapid intensity report systems. In our China, thedensity of earthquake stations increased as a result of the earthquake monitoringnetwork projects during the tenth five-year period, this provides experimentalinfrastructure for some exemplary projects that have been implemented by theinstitutes of some provinces, and provides infrastructure to build nationalearthquake early warning systems and rapid intensity report systems. But theearthquake instrumentation standards and evaluation methods used inearthquake early warning and intensity fast report were not well studied. Sobased on the study of the existing earthquake early warning systems and rapidintensity reporting systems, we proposed some propositional standards aboutinstruments using in earthquake early warning systems and rapid intensity reportsystems. The following is the work we have done.(1) Based on the existing instrumentation standards: Digital Strong MotionAccelerograph and Stipulation on China Digital Seismograph Network, weimplemented our researches as following sequence. Firstly on the instrumentstandards using in rapid intensity report systems, we investigated the existingsystems and analysis the instruments using in these systems and compared thespecifications with the instruments using in our country, and then we proposedtwo experiments to evaluate the instruments as a further evaluation. The firstexperiment was about the response time and the second is about matchingschema of sensor outputs. We implemented the first experiment using highspeed image pick-up, and we gave the standards of communications and timingby investigation.(2) With regard to the instrumentation standards being used in earthquakeearly warning systems, we investigated the existing earthquake early warningsystems and analysis the specifications of the instruments using in these systems.And we also investigated the specifications of the instruments that are using inour China, the content included the categories and specifications, at last weproposed the standards of instruments using in earthquake early warningsystems.(3) Based on the study of current triaxial MEMS accelerometers, weselected the sensor called LIS331DLH which produced by STMicroelectronics,designed and made an accelerograph, we also evaluated its specifications on theshake table, and this provided some instructions about the MEMS technology using in earthquake early warning and rapid intensity report systems.(4) As an application of seismic monitoring, by using the accelerograph wehad made, we designed and implemented a distributed monitoring system.Functions as timing, location, triggering and starting a data stream transportwere implemented on the client, the server received the data stream. Thesignification of this system was to monitor the ground motion and cultivateknowledge for earthquake early system and rapid intensity report systems.