Broadband Downhole Seismic Array at Daan Park, Taipei City
operated by IES since October, 2005
In 2004, the Institute of Earth Sciences (IES) of Academia Sinica was contracted by the Central Geological Survey (CGS) of the Ministry of Economic Affairs to initiate a four year project of¡uGeophysical investigation and monitoring for micro-earthquake in metropolitan Taipei¡v. The purpose of this project is to investigate, evaluate and continuously monitor the seismic activities of the faults and low frequency tremors in the Taipei area. The IES was given the responsibility for setting up a portable broadband seismic network covering the Taipei areat in 2004 and continued in the process of more site selections to install stations from 2005 to 2007. Because the Taipei Basin is a densely urbanized area with wide diffusion of roads and railway traffic, industries and agricultural activities the high cultural noise produced by these activities represents a serious problem which affects seismic observations. Therefore, three permanent broadband downhole seismic stations were also established to avoid noise on the alluvium plain in this project. Installation of these three stations was completed in 2005 at Daan Park (DANB), 2006 at Guandu Nature Park (GDUB) and 2007 at Hsinchung Life Hall Park (SNJB). This is our first experience installing and operating broadband downhole seismic stations in Taipei Basin. Station DANB is at the southeastern side of Taipei Basin and is located in Daan Park, which is of about 2 km away from the Taipei 101 building. The Park was established in 1994 and covers an area of 259,293 square meters.