Earthquakes are phenomena in which mechanical energy is transmitted from the earth's surface by the release of energy from the earth's crust. Therefore, the vibration sensor placed on the ground can be used to detect the occurrence and intensity of the earthquake. The magnitude of the earthquake intensity in Wenchuan, Sichuan, and the subsequent aftershocks are obtained by collecting the vibration sensor information distributed around the earthquake bureau and then reducing it to the vibration data of the seismic center point.
Of course, due to the location of the earthquake monitoring network, the use of wired monitoring is a more appropriate choice. However, in an emergency situation, it is also meaningful to deploy a wireless seismic monitoring network that acquires data at any time. For example, after the earthquake to monitor the occurrence of aftershocks, the transmission of mechanical waves is much slower than the radio waves, so it can take a precious few minutes of warning time to rescue the rescuers.
Harvard University has deployed a similar emergency seismic monitoring system, mainly deployed in volcanic areas to monitor earthquake information caused by volcanic eruptions. The system uses a TelosB wireless sensor node with a 24-bit ADC to monitor the weak vibration information transmitted by the MEMS accelerometer. The nodes are deployed radially around the crater, deploying one node at intervals of hundreds of meters. After the deployment is completed, the vibration information of the earthquake along the radial direction can be monitored.
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