5:51 PM - 5:54 PM
[STT53-P08] Broadband Seismic Array in Micronesia Zone, the South Western Pacific Region
3-min talk in an oral session
Keywords:Broadband seismic observation, Ontong-Java Plataeu
In this program, we performed three items as follows, (1) Restart of measurement in Majuro, Marshall islands (2) Installation in Chuuk island and Kosrae island, FSM (3)Relocation of Palau station. Majuro station had long interval of measurement due to permission of land usage. We restarted observation in small island on Majuro atoll after negotiation. Fortunately this site is very silent because this site is out of place of residence. Chuuk and Kosrae stations are installed as temporal stations jointing BBOBS array supported by local residence. Last Palau station located in downtown, so that measurement condition was not fine. We relocated new site where is silent filed area.
All stations listed above are off-line recording. Our group retrieves data on site about every six month. To reduce the risk of data gap by power supply trouble, line trouble, GPS trouble and system trouble, we installed observation system multiply for all parts.
As for new temporal stations, Chuuk and Kosrae stations, we retrieved the data last December. We evaluated noise signal level and checked seismic event data. Generally seismic station is ocean island has high noise level and unstable recording. In these new stations, both stations record stable data and low noise signal except oceanic wave origin's signal. Especially horizontal component of Chuuk station is close to low noise model in long period component. PKP phase excited by distant deep earthquake is recorded in original raw data. The performance of these stations expects more fine quality data in long-term operation to our research.