Progress of the earthquake early warning system in Fujian, China

Abstract

In this article, we systematically introduce the latest progress of the earthquake early warning (EEW) system in Fujian, China. We focus on the following key technologies and methods: continuous earthquake location and its error evaluation; magnitude estimation; reliability judgment of EEW system information; use of doubleparameter principle in EEW system information release threshold; real-time estimation of seismic intensity and available time for target areas; seismic-monitoring network and data sharing platform; EEW system information release and receiving platform; software test platform; and test results statistical analysis. Based on strong ground motion data received in the mainshock of the Wenchuan earthquake, the EEW system developed by the above algorithm is simulated online, and the results show that the system can reduce earthquake hazards effectively. In addition, we analyzed four earthquake cases with magnitude greater than 5.5 processed by our EEW system since the online-testing that was started one year ago, and results indicate that our system can effectively reduce earthquake hazards and have high practical significance.

A Low-Latency Seismic Recorder for Earthquake Early Warning

“…As can be seen from Figure 3, although lead time of only 0.8 s is obtained for the simulated earthquake, the time is sufficient for us to take appropriately automatic emergency actions for some important infrastructures, such as slowing down high-speed trains and shutting down nuclear facilities, in order to further reduce losses caused by earthquakes. The low-latency seismic recorders have been deployed in large quantities to the prototype EEWS developed by Fujian Provincial Seismological Bureau [11].…”

“…Earthquake early warning system (EEWS) is one of the most effective ways for earthquake disaster mitigation. Many countries and regions around the world have already developed EEWSs, such as California [1] [2], Japan [3] [4], Mexico [5], Taiwan [6] [7], Italy [8], or are developing and testing the prototype systems, including Turkey [9], China [10][11][12][13], Iberia [14], etc.…”

Evaluation of the Grillo sensor, a low-cost accelerometer for IoT-based Real-time seismology

“…EEWs have proven to be capable of providing timely alerts during earthquakes in Mexico (Aranda et al, 1995), Japan (Wenzel and Zschau, 2014), and Taiwan (Chen et al, 2015). Multiple other EEW systems are either in development or undergoing testing (Allen and Melgar, 2019), such as on the US West coast (Kohler et al, 2018), in Italy (Satriano et al, 2011), and in China (Jin et al, 2013).…”

Performance Evaluation of Low-Cost Seismic Sensors for Dense Earthquake Early Warning: 2018–2019 Field Testing in Southwest China

“…EEW systems of Taiwan have been in operation since 1993, and are capable of sending predicted intensity and warning times to school attendees [6,7,8,9]. Besides, some other EEW systems were also developed and tested in many countries and regions, such as California [10,11], southern Italy [12], Southwest Iberia [13], India [14], and China [15,16].…”