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:::Active Fault Monitoring And Evaluation On Earthquake Potential
Following the magnitude 6.2 July 17, 1998 earthquake at Juili, Chiayi, the Central Geological Survey began to plan an expansion to monitoring on active faults and evaluation on earthquake potentials in southwest Taiwan, basing on past results on preliminary investigation on active fault distribution in Taiwan. The expansion schedule will be year-by-year, and region-by-region. The ultimate goal is attaining complete coverage for the entire island of Taiwan.
A. Installing fault activity monitoring stations
  Plan on installation of fault activity monitoring station for southwest Taiwan changed from installing one station to three monitoring stations after taking into consideration factors in web station design, costs and technology transfer. These are the South Station for the Tsengwen Reservoir, North Station for the Tsengwen Reservoir, and the Shihpawan Station at Chiahsien. At these stations, installed instrument includes tensor strainmeter, seismograph, ground-mounted hyetometrograph, barometer and GPS antennae. The strainmeter is the most precise piece of instrument among all installed ones, it measurers up to prercision as high as 10-9 ~ 10-12. It is sensitive tto creep in the fault, and also sensitive to the so-called "slow" and "quite" earthquakes that have periods from several hours to several months.
B. Environmental geochemical investigation and research on fault activities
  Results for the 2002 fiscal year include: (i) Continued observation at the Chunglun Station; (ii) Continued works on groundwater table change in groundwater wells in southwest Taiwan, and continued measuring on cations, anions and tritium contents in hot springs; (iii) Conclude installation of automatic, continuous monitoring instrument at the selected Taian Hot Spring in the Miaoli-Hsinchu area, and conduct test on monitored results to evaluate its relation with fault activity; (iv) Perform general environmental geochemical investigation along the Chingshan-Shanchiao Fault in northern Taiwan area, and select an adequate location for installation of a new monitoring station in fiscal year 2003.
C. Investigation and research on geological structure in fault zone and crustal deformation
  Main important result and achievement lies in data interpretation and seismic profile analysis and interpretation basing on data from the surficial geology, bore hole geological data and seismic survey data. Eight balanced geologic structure profiles were concluded, and the regional structural evolution history was established. The strike of balanced profiles is NWW-ESS, located in the study area from Chungli to Miaoli.

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