岩石圧縮破壊に伴うマイクロ波放射の観測

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タイトル別名
  • An Experimental Study of Microwave Emissions from Compression Failure of Rocks
  • ガンセキ アッシュク ハカイ ニ トモナウ マイクロハ ホウシャ ノ カンソク

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抄録

Electromagnetic emissions observed in a series of rock fracture tests are described. Four kinds of rocks, basalt, gabbro, granite and quartzite were pressed by uniaxial compression to fracture, for all of which many signals were detected at two microwave bands (2GHz and 300MHz). These detected signals consist of intermittent pulses of a short duration. Comparing the microwave records and the observation with a high-speed digital video camera, we found that the pulse signals were generated after the decrease of the axial load, and even after the macroscopic fracture (deformation) was completed. This differs from the occurrence of lower frequency emissions (0.3-300kHz) monitored as well, which became active and was strongest during the load decrease. The occurrence of signals at the two microwave bands did not always coincide, but a signal at 300MHz often followed a signal at 2GHz with a short interval of 50-100ns. An additional detector at 22GHz picked up emissions only for quartzite, which occurred exclusively during the decrease of axial load.

収録刊行物

  • 地震　第２輯

    地震　第２輯 58 (4), 375-384, 2006

    公益社団法人 日本地震学会

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