Chile experienced a magnitude 8.1 earthquake this morning. The epicenter was at sea. The city of Iquique, northern Chile, may be less than 100 kilometers, or it may trigger a tsunami and people take refuge on the streets. On the 28th, an earthquake occurred in southern California. The good news is that the warning system issued a warning four seconds in advance and avoided the Serious disasters. This again proves that the earthquake can be monitored in advance.

According to the "Los Angeles Times," a magnitude 5.1 earthquake struck the town of Lahabra near Los Angeles city in southern California on the 28th. The depth of the source is about 7.5 kilometers. Four seconds before the earthquake, seismologists in Pasadena City had foreseen that the earthquake was coming and issued a warning in advance, which confirmed once again that the preliminary earthquake warning system being tested by the Federal Geological Survey was effective.

Lucy Jones, a seismologist at the agency, said that the warning system was effective because the earthquake traveled at the speed of sound, and the early warning system detector that first detected the vibration near the epicentre of the earthquake transmitted information at a faster speed of light. The warning distance was very high. Far inhabitants, the earthquake is about to come.

Early in March, a magnitude 4.4 earthquake struck near the Westwood region in southern California. The warning system also warned the seismic center about two seconds before the earthquake.

For our country, real-time ground motion monitoring and intensity rapid report have only just begun. In the past, the construction of the earthquake monitoring system was more focused on the observation effect of the instrument, and more attention was paid to the station construction and observation environment construction. The level of professional services for earthquake rapid reporting was very high. high. There are not many rapid outputs needed for emergency response, disaster relief, and disaster reduction. If a large number of acceleration sensors are deployed in areas where large earthquakes occur, we can publish the results of earthquake intensity distribution in areas with extreme earthquakes and strong earthquakes in near real time, which is very important for saving lives, disaster relief, and stabilizing the society. The role. For the past two years, Japan has directly used the speed or acceleration sensor to express the intensity of ground motion, which has the characteristic of quick post-earthquake release. In Yokohama, Japan, nearly one thousand intensity meters were deployed to conduct an earthquake intensity report. It is also hoped that China's seismic detection technology will be fully utilized under the development of sensor technology, and natural disasters such as landslides and mud flows that have occurred after the earthquake will be fully developed under the promotion of sensor technology.

For sensors, there is a great advantage in the collection of relevant data. However, the application of a large-scale sensor base station monitoring system does not mean that it can accurately and timely perform earthquake prediction. The main task of the sensor is to analyze the usual data and monitor the situation in some areas after the earthquake. However, it cannot be denied that sensor technology does have a very good technical prospect in earthquake-related monitoring.

In addition, earthquake observation is also our country's prevention base. Earthquake observation is the basis for earthquake prevention and disaster reduction. At present, there are only 33 seismograph stations and 109 unattended seismograph stations in Hebei alone. In order to reduce interference, most of these seismic stations are located in remote mountainous areas. More than 200 professional technicians for earthquake prevention and disaster reduction have been sticking to the line of earthquake monitoring all year round, obscure and loneliness. They used seismic, electromagnetic, deformation, fluid, and other observational methods to monitor changes in the geophysical field, and made important contributions to earthquake prevention and disaster reduction.