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Variations of Soil Gases on the Active Chihshang Fault in a Plate Suture Zone, Eastern Taiwan

Variations of Soil Gases on the Active Chihshang Fault in a Plate Suture Zone, Eastern Taiwan. Ching-Chou Fu 1 , Tsanyao Frank Yang 1 , V. Walia 2 , J.-C. Lee 3 , J.-J. Dong 4 , T.-K. Liu 1 , C-H. Chen 1 and C.-S. Hou 5 1. Department of Geosciences, National Taiwan University, Taiwan

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Variations of Soil Gases on the Active Chihshang Fault in a Plate Suture Zone, Eastern Taiwan

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  1. Variations of Soil Gases on the Active Chihshang Fault in a Plate Suture Zone, Eastern Taiwan Ching-Chou Fu1, Tsanyao Frank Yang1, V. Walia2, J.-C. Lee3, J.-J. Dong4, T.-K. Liu1, C-H. Chen1 and C.-S. Hou5 1. Department of Geosciences, National Taiwan University, Taiwan 2. National Center for Research on Earthquake Engineering, NARL, Taiwan 3. Institute of Earth Sciences, Academia Sinica, Taiwan 4. Institute of Applied Geology, National Central University, Taiwan 5. Central Geological Survey, MOEA, Taiwan

  2. Geological setting Lee et al. (2003)

  3. Lee & Angelier (1993) Yu & Kou (2001)

  4. Creepmeters data Lee et al. (2003)

  5. Anomalies => yes !! fault and/or fracture !!no anomalies => may be or may be not !! Fu et al. (2005)

  6. Soil gases result

  7. Seismic refection profile Chang (2008)

  8. Combining the above-mentioned data

  9. Configuration of automatic station at CS Equipped with:Rn detector

  10. Lee et al. (2006)

  11. Conclusion • The soil gas method is considered to be a suitable tool for the exploration of buried faults and/or fractures, at least in Taiwan. • Some anomalous radon concentrations can be observed. These anomalies usually appeared a few days before the local earthquakes, which mainly occurred in eastern Taiwan. • The heavy rainfall seemed to trigger creeping in only a few day. This implies that the creep zone is probably shallow. It is worth to note that some of the anomalies could not be related with any earthquake events, and considered may be related to surface creeping of the fault in studied area. • Soil radon anomalies seem to be more useful related to the earthquake events. It is worthy to continuous monitor to further clarify the relationship between soil gas variations andregional crustal stress/strain in the area.

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