Precise Temperature Measurements and Earthquake Heat Associated with the 1999 Chi-Chi, Taiwan Earthquake

Kano, Yoshiaki; Mori, J.; Fujio, Ryota; Yanagidani, Takashi; Nakao, S.; Ito, H.; Matsubayashi, Osamu; Fong, Kuo

doi:10.5194/sd-specialissue-94-2007

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“…This increase in temperature corresponds to an anomaly ∼40% above the conductive solution ( Figure 3b) and would result in slight overestimates of the frictional resistance during slip rather than an underestimate of frictional resistance. The thermal anomaly across the Chelungpu fault has been variously interpreted in terms of frictional heating or heterogenous rock properties [Tanaka et al, 2007], although the latter interpretation has been questioned [Kano et al 2007]. Unfortunately, deteriorating hole conditions prevented the ability to repeat temperature profiles.…”

Section: Comparison With Datamentioning

confidence: 99%

Does hydrologic circulation mask frictional heat on faults after large earthquakes?

et al. 2010

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[1] Knowledge of frictional resistance along faults is important for understanding the mechanics of earthquakes and faulting. The clearest in situ measure of fault friction potentially comes from temperature measurements in boreholes crossing fault zones within a few years of rupture. However, large temperature signals from frictional heating on faults have not been observed. Unambiguously interpreting the coseismic frictional resistance from small thermal perturbations observed in borehole temperature profiles requires assessing the impact of other potentially confounding thermal processes. We address several issues associated with quantifying the temperature signal of frictional heating including transient fluid flow associated with the earthquake, thermal disturbance caused by borehole drilling, and heterogeneous thermal physical rock properties. Transient fluid flow is investigated using a two-dimensional coupled fluid flow and heat transport model to evaluate the temperature field following an earthquake. Simulations for a range of realistic permeability, frictional heating, and pore pressure scenarios show that high permeabilities (>10 −14 m 2 ) are necessary for significant advection within the several years after an earthquake and suggest that transient fluid flow is unlikely to mask frictional heat anomalies. We illustrate how disturbances from circulating fluids during drilling diffuse quickly leaving a robust signature of frictional heating. Finally, we discuss the utility of repeated borehole temperature profiles for discriminating between different interpretations of thermal perturbations. Our results suggest that temperature anomalies from even low friction should be detectable at depths >1 km 1 to 2 years after a large earthquake and that interpretations of low friction from existing data are likely robust.Citation: Fulton, P. M., R. N. Harris, D. M. Saffer, and E. E. Brodsky (2010), Does hydrologic circulation mask frictional heat on faults after large earthquakes?,

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Section: Comparison With Datamentioning

confidence: 99%

Does hydrologic circulation mask frictional heat on faults after large earthquakes?

et al. 2010

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Precise Temperature Measurements and Earthquake Heat Associated with the 1999 Chi-Chi, Taiwan Earthquake

Abstract: No abstract available. <br><br> doi:<a href="http://dx.doi.org/10.2204/iodp.sd.s01.40.2007" target="_blank">10.2204/iodp.sd.s01.40.2007</a>

Cited by 1 publication

References 2 publications

Does hydrologic circulation mask frictional heat on faults after large earthquakes?

Does hydrologic circulation mask frictional heat on faults after large earthquakes?

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