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Intermediate-depth earthquake faulting by dehydration embrittlement with negative volume change

Author

Listed:
  • Haemyeong Jung

    (University of California)

  • Harry W. Green II

    (University of California
    University of California)

  • Larissa F. Dobrzhinetskaya

    (University of California)

Abstract

Earthquakes are observed to occur in subduction zones to depths of approximately 680 km, even though unassisted brittle failure is inhibited at depths greater than about 50 km, owing to the high pressures and temperatures1,2,3. It is thought that such earthquakes (particularly those at intermediate depths of 50–300 km) may instead be triggered by embrittlement accompanying dehydration of hydrous minerals, principally serpentine1,2,3. A problem with failure by serpentine dehydration is that the volume change accompanying dehydration becomes negative at pressures of 2–4 GPa (60–120 km depth), above which brittle fracture mechanics predicts that the instability should be quenched4,5. Here we show that dehydration of antigorite serpentinite under stress results in faults delineated by ultrafine-grained solid reaction products formed during dehydration. This phenomenon was observed under all conditions tested (pressures of 1–6 GPa; temperatures of 650–820 °C), independent of the sign of the volume change of reaction. Although this result contradicts expectations from fracture mechanics, it can be explained by separation of fluid from solid residue before and during faulting, a hypothesis supported by our observations. These observations confirm that dehydration embrittlement is a viable mechanism for nucleating earthquakes independent of depth, as long as there are hydrous minerals breaking down under a differential stress.

Suggested Citation

  • Haemyeong Jung & Harry W. Green II & Larissa F. Dobrzhinetskaya, 2004. "Intermediate-depth earthquake faulting by dehydration embrittlement with negative volume change," Nature, Nature, vol. 428(6982), pages 545-549, April.
  • Handle: RePEc:nat:nature:v:428:y:2004:i:6982:d:10.1038_nature02412
    DOI: 10.1038/nature02412
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    Cited by:

    1. Yu-Hsiang Chien & Enrico Marzotto & Yi-Chi Tsao & Wen-Pin Hsieh, 2024. "Anisotropic thermal conductivity of antigorite along slab subduction impacts seismicity of intermediate-depth earthquakes," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    2. Seohee Yun & Huijeong Hwang & Gilchan Hwang & Yeongkyoo Kim & Douglas Blom & Thomas Vogt & Jeffrey E. Post & Tae-Yeol Jeon & Tae Joo Shin & Dong-Zhou Zhang & Hiroyuki Kagi & Yongjae Lee, 2022. "Super-hydration and reduction of manganese oxide minerals at shallow terrestrial depths," Nature Communications, Nature, vol. 13(1), pages 1-8, December.

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