Optimization of Elarms3 in Korean Peninsula Using Simulation

Session: Earthquake Early Warning: Current Status and Latest Innovations [Poster]
Type: Poster
Date: 4/29/2020
Time: 08:00 AM
Room: Ballroom
Description: 

The EEW system is a technology that alerts people to minimize damage before S-wave seismic wave arrives. KMA uses E3 based on the ElarmS developed by University of California Berkeley. E3 is a Korean version of ElarmS that was optimized for the seismic environment on the Korean Peninsula. There are characteristics: 1) most depth of bedrock condition in Korean Peninsula is found to be less than 30m under surface 2) the hypocenter was located a shallow depth 3) major earthquakes were more than M_L=6.0 after digital observation. Also, our mission need to successfully implement services without false alarms. In countries where there are not many earthquakes, one false alarm can significantly affect the reliability of the EEW because it is relatively more sensitive to early earthquake alarms. We are simulated to analysis the Korean earthquakes before applying the real-time system. In addition, it has the advantage of obtaining analysis results for events without real-time operation when parameter setting is changed. The E3 teleseismic filter has applied the Filter Bank method was optimized for the Korean observation environment. teleseismic filter using filter bank classifies teleseismic and local earthquake using attenuation law of high frequency component for P wave. Filter Bank preset 9 frequency band to filter high and low frequency components and classify them into teleseismic and local earthquakes. When using the combination of the 3(6-12Hz) and 6th (0.75-1.5Hz) bands compared to the reference combination of the 3 and 7th (0.375-0.75Hz) bands, it shows 27% of performance improvement. In addition, we reviewed the newly added trigger discrimination module and have compared the simulate of E3 to the results of operated KMA ElarmS in the past. It showed that the assoc. stations differ depend on the choices the module in small magnitude earthquakes. The result indicates that review is needed to apply the newly added module in Korean peninsula. In conclusion, we proposed the optimization module for Korean peninsula and reviewed to be applied for real-time operation system.

Presenting Author: DoYoon Lim

Authors