|
| :::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.
|
|
:::© CENTRAL GEOLOGICAL SURVEY, MOEA
P.O.BOX 968, Taipei, Taiwan, ROC
2, Lane 109, Hua-Hsin Street, Chung-Ho, Taipei, Taiwan 235, Republic of China
TEL: +886-2-29462793FAX: +886-2-29429291
E-mail:cgs@moeacgs.gov.tw
The best browsing mode is 1024*768
Site visited :
0002270096
Last maintained : 2008-12-04
|
