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Description
The auxiliary seismic station AS40 in Lembang, part of the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) network, is also registered as a seismic monitoring station in Indonesia under the code IA LEM. In addition to its primary role in monitoring nuclear events, this station is used for earthquake location determination. This study relocated earthquake hypocenters using the HypoDD method, both with and without data from the IA LEM station. The analysis involved 92 earthquake data sets from the Java mainland (105°E – 110°E, 5°S – 7°S) for the period 2023–2024. The input parameters for both methods were standardized, and both successfully relocated 60 out of 92 earthquakes. Results show that incorporating data from the IA LEM station improved the epicentral location, with a maximum distance of 1.38 km. The average depth was 2.2 km. The ellipsoid error decreased even though the average residual with the Lembang station was 0.01 seconds higher compared to the residual without it. Based on these results, it can be concluded that the Lembang auxiliary station plays an important role in earthquake location determination, especially for high resolution location determination on the island of Java.
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