Broadband Downhole Seismic Array at Pader Park, Panchiao, New Taipei City

operated by IES in December, 2008

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 ofuGeophysical investigation and monitoring for micro-earthquake in metropolitan Taipeiv. 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 Metropolitan Area (TMA). The IES was given the responsibility for setting up a portable broadband seismic network covering the TMA 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 arrayss 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 Sinjhuang Life Hall Park (SNJB).

The initial phase of the downhole seismic observations in TMA was finished in June 2007. In order to continue providing basic ground motion data to evaluate site response effects in this area, the CGS decided to initiate the second phase of the program in the TMA to continue monitoring earthquakes. Selection of the boreholes is dependent on the site conditions (geology, communications, and accessibility) and the position of the present downhole network. The new borehole in 2008 is at Pader Park (PADB), Panchiao City.

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