| 英文摘要 |
The present study is proposed to investigate geochemical variations of soil-gas composition in the vicinity of the geological fault zones and to determine the influence of such formations on the enhanced concentrations of different gases in soil to monitor the tectonic activity in the region. To carry out the present investigations, variations in temporal soil-gases compositions were measured at continuous earthquake monitoring stations established along different faults. Before selecting a monitoring site, the occurrence of deeper gas emanation was investigated by the soil-gas surveys and followed by continuous monitoring of some selected sites with respect to tectonic activity to check the sensitivity of the sites. From the results of long term geochemical monitoring at the established monitoring stations we can divide the studied area in two different tectonic zones. We proposed tectonic based model for earthquake forecasting in Taiwan and tested it for some big earthquakes occurred in recent past. Based on the anomalous signatures from particular monitoring stations we are in a state to identify the area for impending earthquakes of magnitude ≧5 and we have tested it for some earthquakes which rocked the country in last six months. Most of earthquakes having magnitude ≧ 5 with local intensity ≧ 2 at the monitoring stations, epicentral distance < 100 kms with focal depth < 40 kms have shown precursory signals and fitted very well according to the proposed model for the region. |
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