TCDP井下地震儀安裝於台中大坑地區為集集地震最大同震變形發生之區域，地震儀記錄到規模最小之地震為MW0.0。地表安裝了10個短週期觀測網幫助精準定位。我們利用地震定位軟體MIMO判斷P波與S波到時、方位角與入射角協助定位。地震定位結果發現台中大坑地區微地震發生最頻繁的區域在10公里深左右的地震活動帶上，靠近地表附近的車籠埔主斷層帶上幾乎沒有任何微地震的發生。連續GPS觀測也證實此區域並沒有震後滑移的情形。這暗示了在車籠埔主斷層帶北部最大同震變形的發生區域累積應力已經完全於集集地震時釋放，因此在間震期完全鎖住（Lock）並沒有任何的滑移。2006年11月、2007年1月、3月及4月進行4次灌水試驗，在TCDP-C井中注入3至5MPa的高壓水，期待能記錄到微地震異常。但我們並沒有發現地震活動度在這些月份中有與灌水試驗相關的異常現象，此現象可能因斷層帶之滲透率太低造成灌入水量太少，影響區域有限。震源參數尺度分析方面，分析了139筆地震規模於Mw0.0~2.5後發現，地震規模與拐角頻率並無相關。規模與破裂半徑亦無相關，但是規模與視應力有顯著的正相關情況。本研究成果與Abercrombie於1995年之研究成果相似有正相關之情況。但Ide和Beroza修正路徑效應得到規模與視應力無相關。本研究目前尚未考慮路徑效應影響，此情況值得未來深入探討。

Microearthquakes with magnitude down to 0.0 were detected by the TCDP BHS. A temporary seismic array with 10 short period seismometers around the TCDP drill site was also installed to incorporate with the TCDP BHS for the precise locations of the microearthquakes. A location software (MIMO) (Oye and Roth, 2003) was used to determine P- and S-wave onset times, incidence and azimuth angles for the locations of the microearthquakes. Regardless of the large co-seismic slip of 12 m at the drill site during the 1999 Chi-Chi earthquake, our preliminary studies show very less seismicity near the drill site from the TCDP BHS recording. The micro earthquakes clustered at a depth of 8-10 km, where the 30 degree dipping of the Chelungpu thrust fault becomes flat to a decollement of the Taiwan fold-and-thrust tectonic structure. As a continuous GPS survey did not observe post-slip at the large slip region, and as no seismicity was observed near the drill site, we suggest that the thrust belt above the decollement during the interseismic period is locked. A Fluid Injection Test (FIT), pumping high pressure fluid into hole B and C with hole A as observation well was carried out at the TCDP boreholes in November 2006, and January, March and April, 2007. Compared with background seismicity in November, 2007, the observation did not show significant correlation of the FIT related seismicity, despite the distinct observations on the arrival of gas and chemical monitoring through FIT. This discrepancy in the physical and chemical observations to the FIT is an odd. It is possible that the fluid rate of FIT experiments is too deficient to trigger micro-earthquakes. The low injected fluid rate might indicate the low permeability of the fault zone. In addition to the FIT related observation, we also try to understand the scaling of the small earthquakes in stress drops and seismic moment. The source parameters of 139 micro-events were examined from the source spectra using Brune ω-square model for a constant Q model. The scaling of the magnitude to the Brune stress drop is a significant positive correlation. However, there has been a debate that this positive relationship might be biased for without Q correction. We had observed 26 clusters repeating events showing similar waveforms. But, those clusters have magnitude difference less than 1.0. It was hard to use empirical Green’s function to remove the path effect to validate the source scaling studies.

Abercrombie, R., “Earthquake source scaling relationships from -1 to 5 ML using seismograms recorded at 2.5-km depth”, J. Geophys. Res., Vol 100, No 12, pp 24015-24036, 1995.
Ake, J., K. Mahrer, D. O’Connel and L. Block, “Deep-Injection and Closely Monitored Induced Seismicity at Paradox Valley, Colorado”, Bull. Seism. Soc. Am., Vol 95, No 2, pp 664-683, 2005.
Aki, K. and P. Richards, Quantitative Seismology, University Science Books, 2002.
Brune, J., “Tectonic Stress and the Spectra of Seimic Shear Waves from Earthquakes”, J. Geophys. Res., Vol 75, pp 4997-5009, 1970.
Carena, S., J. Suppe and H. Kao, “Active detachment of Taiwan illuminated by small earthquakes andits control of first-order topography”, Geology, Vol 30, No 10, pp 935-938, 2002.
Chang, C., Y. Wu, T. Shin and C. Wang, “Relocation of the 1999 Chi-Chi Earthquake in Taiwan”, TAO, Vol 11, No 3, pp 581-590, 2000.
Chang, C., Y. Wu, L. Zhao, and F. Wu, “Aftershocks of the 1999 Chi-Chi, Taiwan, Earthquake: The First Hour”, Bull. Seism. Soc. Am., Vol 97, No 4, pp 1245–1258, 2007,
Chavarria, J., P. Malin, R. Catchings and E. Shalev, “A Look Inside the San Andreas fault at Parkfield Through Vertical Seismic Profiling”, Science, Vol 302, No 5, 2003.
Dreger, D., Nadeau, R., Chung, A., Repeating earthquake finite source models: Strong asperities revealed on the San Andreas Fault, Geophys. Res. Lett. 34, 2007.
Eshelby, J., “The determination of the elastic held of an ellipsoidal inclusion and related problems”, Proc. R. Soc. London, Vol 241, pp 376-396, 1957.
Harris, R., Barall, M. Archuleta, R., Aagaard, B., Ampuero, J., Andrews, D., Cruz-Atienza, V., Dalguer, L., Day, S., Duan, B., Dunham, E., Ely, G., Kaneko, Y., Kase, Y., Lapusta, N., Liu, Y., Ma, S., Oglesby, D., Olsen, K., Pitarka, A., Song, S. and Templeton, E., The SCEC-USGS Rupture Dynamics Code Comparison Exercise. Seism. Res. Lett., Vol 80 (1), pp 119-126, 2009.
Hiramatsu, Y., H. Yamanaka, K. Tadokoro, K. Nishigami and S. Ohmi, “Scaling law between corner frequency and seismic moment of mircoearthquakes: Is the breakdown of the cube law a nature of earthquakes?”, Geophys. Res. Lett., Vol 29, No 8, pp 52-1-52-3, 2002.
Hough, S., “Empirical Green’s function analysis: Take the next step”, J. Geophys. Res., Vol 102, No. B3, pp 5369-5384, 1997.
Hough, S., J. Lees and F. Monastero, “Attenuation and Source Properties at the Coso Geothermal Area, California”, Bull. Seism. Soc. Am., Vol 89, No 6, pp 1606-1619, 1999.
Hsu, Y., J. Avouac, S. Yu, C. Chang, Y. Wu, J. Woessner, “Spatio-temporal slip, and stress level on the faults within the western foothills of Taiwan:
implications for fault frictional properties”, Submitted to PAGEOH on 15 September 2008.
Ide, S. and G. Beroza, “Does apparent stress vary with earthquake size?”, Geophys. Res. Lett., Vol 28, No 17, pp 3349-3352, 2001.
Ide, S., G. Beroza, S. Prejean and W. Ellsworth, “Apparent break in earthquake scaling due to path and site effects on deep borehole recordings”, J. Geophys. Res., Vol 108, No B5, pp 2271-2284, 2003.
Igarashi, T., T. Matsuzawa, and A. Hasegawa, Repeating earthquakes and interplate aseismic slip in the northeastern Japan subduction zone, J. Geophys. Res. Vol 108, pp 2249, 2003.
Jost, M., T. Bubelberg, O. Jost and H. Harjes, “Source Parameters of Injection-Induced Microearthquakes at 9 km Depth at the KTB Deep Drilling Site, Germany”, Bull. Seism. Soc. Am., Vol 88, No 3, pp 815-832, 1998.
Kanamori, H., “The Energy Release in Great Earthquakes”, J. Geophys. Res., Vol 82, No 20, pp 2981–2987, 1977.
Kim, K., J. Chiu, J. Pujol, K. Chen, B. Huang, Y. Yeh and P. Shen, “Three-dimensional VP and VS structural models associated with
the active subduction and collision tectonics in the Taiwan region”, Geophys. J. Int, Vol 162, pp 204-220, 2005.
Kimura, H., K. Kasahara, T. Igarashi, and N. Hirata, Repeating earthquake activities associated with the Philippine Sea plate subduction in the Kanto district, central Japan: a new plate configuration revealed by interplate aseismic slips, Tectonophysics, Vol 417, 101–118, 2006.
Lambe, T. and R. Whitman, Soil Mechanics, SI Version, Wiley India, 1979
Lay, T. and T. Wallace, Modern Global Seismology, Academic Press., San Diego, 1995.
Leonard, M. and B. Kennett, “Multi-component autoregressive techniques for the analysis of seismograms.”, Physics of the Earth and Planetary Interiors, Vol 113, pp 247-263, 1999.
Lockner, D., C. Morrow, S. Song, S. Tembe and T. Wong, “Preliminary measurements of permeability and shear strength of Chelungpu fault core samples”, TCDP Special Sections in Annual Meeting of the Geological Society,
Jhoungli, Taiwan, 2005.
Ma, K. F., Y. Y. Lin, S. J., Lee, H. Tanaka, Fault Zone Dilatational Process Observed in Taiwan Chelungpu-Fault Borehole Seismometers, SSA Annual Meeting, Monterey, U.S.A, 2009.
Nadeau, R. M., W. Foxall, and T. V. McEvilly . Clustering and periodic recurrence of microearthquakes on the San Andreas fault at Parkfield, California, Science, Vol 267, pp 503–507, 1995.
Nadeau, R. M., L. R. Johnson, Seismological Studies at Parkfield VI: Monment Release Rate and Estimates of Source Parameters for Small Repeating Earthquakes., Bull. Seism. Soc. Am., Vol 88, No 3, pp 790-814, 1998.
Oye, V. and M. Roth, “Automated seismic event location for hydrocarbon reservoirs”, Computers & Geosciences, Vol 29, pp 851-863, 2003.
Oye, V., J. Chavarria and P. Malin, “Determining SAFOD area microearthquake locations solely with the Pilot Hole seismic array data”, Geophys. Res. Lett., Vol 31, 2004
Oye, V., H. Bungum and M. Roth, “Source Parameters and Scaling Relations for Mining-Related Seismicity within the Pyhasalmi Ore Mine, Finland.”, Bull. Seism. Soc. Am., Vol 95, No 3, pp 1011-1026, 2005.
Rietbrock, A., “P-wave attenuation structure in the fault area of the 1995 Kobe earthquake, J. Geophys. Res., Vol 28, 1999.
Sammis, C. G., and J. R. Rice, Repeating earthquakes as low-stressdrop events at a border between locked and creeping fault patches, Bull. Seismol. Soc. Am. Vol 91, pp 532–537, 2001.
Sato, T. and T. Hirasawa, “Body wave spectra for propagating shear cracks”, J. Phys. Earth , Vol 21, pp 415-431, 1973.
Schaff, D. P., G. C. Beroza, and B. E. Shaw, Postseismic response of repeating aftershocks, Geophys. Res. Lett. Vol 25, pp 4549–4552, 1998.
Scherbaum, F., “Combined inversion for the three-dimensional Q structure and source parameters using microearthquake spectra”, J. Geophys. Res., Vol 95, No 12 pp 423-428, 1990.
Seeber, L., J. Armbruster and W. Kim, “A Fluid-Injection-Triggered Earthquake Sequence in Ashatabula, Ohio: Implications for Seismogenesis in Stable Continental Regions”, Bull. Seism. Soc. Am., Vol 94, No 1, pp 76-87, 2004.
Stork, A. and H. Ito, “Source Parameter Scaling for Small Earthquakes Observed at the Western Nagano 800-m-Deep Borehole, Central Japan”, Bull. Seism. Soc. Am., Vol 94, No 5, pp 1781-1794, 2004.
Tadokoro, K., M. Ando and K. Nishigami, “ Induced earthquakes accompanying the water injection experiment at the Nojima fault zone, Japan: Seismicity and its migration”, J. Geophys. Res, Vol 105, No 3, pp 6089-6104, 2000.
Tadokoro, K., K. Nishigami, M. Ando, N. Hirata, T. Iidaka, T. Hashida, K. Shimazaki, S. Ohmi, Y. Kano, M. Koizumi, S. Matsuo and H. Wada, “Seismicity changes related to a water injection experiment in the Nojima Fault Zone”, The Insland Arc, Vol 10, pp 235-243, 2001.
Thurber, C., S. Roecker, K. Roberts, M. Gold, L. Powell, and K. Rittger, “Earthquake locations and three-dimensional fault zone structure along
the creeping section of the San Andreas fault near Parkfield, CA:
Preparing for SAFOD”, Geophys. Res. Lett., Vol 30, No 3, pp 1112-1115, 2003.
Uchida, N., T. Matsuzawa, A. Hasegawa, and T. Igarashi, Interplate quasi-static slip off Sanriku, NE Japan, estimated from repeating earthquakes, Geophys. Res. Lett. Vol 30, 2003.
Vidale, J. E., W. L. Ellsworth, A. Cole, and C. Marone, Variations in rupture process with recurrence interval in a repeated small earthquake, Nature, Vol 368, 624–629, 1994.
Wang,Yu-Ju, Ma, Kuo-Fong, Mouthereau, Frederic, Eberhart-Phillips, Donna, “Three dimensional Qp- Qs-Tomography beneath Taiwan Orogenic Belt: Comparison to the Tectonic and the Thermal Structure”, not publish yet.
Yamada, T., J. Mori, S. Ide, R. Abercrombie, H. Kawakata, M. Nakatani, Y. Iio and H. Ogasawara, “Stress drops and radiated seismic energies of microearthquakes in a South African gold mine”, J. Geophys. Res., Vol 112, 2007.
Zoback, M. and H. Harjes, “Injection-induced earthquakes and crustal stress at 9 km depth at the KTB deep drilling site, Germany.”, J. Geophys. Res., Vol 102, pp 18477-18491, 1997.
王郁如，「台灣弧陸碰撞構造之地殼及頂部地函的三維S波衰減模型」，國立中央大學，碩士論文，2004年。
許瑞育，「沉積岩應力相關之流體特性與沉積盆地之孔隙水壓異常現象」，國立中央大學，碩士論文，2007年。
郭挺鈞，「台灣車籠埔斷層注水實驗期間的氣體與水化學分析」，國立中央大學，碩士論文，2008年。