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Slow slip source characterized by lithological and geometric heterogeneity

Journal Article · · Science Advances
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  1. National Institute of Water and Atmospheric Research (NIWA), Wellington (New Zealand)
  2. GNS Science, Lower Hutt (New Zealand)
  3. Pennsylvania State Univ., University Park, PA (United States)
  4. Imperial College, London (United Kingdom)
  5. New Mexico Institute of Mining and Technology, Socorro, NM (United States)
  6. Univ. of Wales, Cardiff (United Kingdom)
  7. Univ. degli Studi di Pisa (Italy)
  8. Univ. of California, Santa Cruz, CA (United States)
  9. Brown Univ., Providence, RI (United States)
  10. Rice Univ., Houston, TX (United States)
  11. Texas A & M Univ., College Station, TX (United States)
  12. Helmholtz Centre for Ocean Research, Kiel (Germany)
  13. Kochi Univ. (Japan)
  14. Univ. do Vale do Rio dos Sinos (Brazil)
  15. National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan)
  16. Univ. of Leeds, Leeds (United Kingdom)
  17. Oregon State Univ., Corvallis, OR (United States)
  18. Hohai Univ. (China)
  19. Univ. de Lorraine (France)
  20. Commonwealth Scientific and Industrial Research Organization (CSIRO), Kensington WA (Australia)
  21. The Ohio State Univ., Columbus, OH (United States)
  22. Colorado School of Mines, Golden, CO (United States)
  23. Cornell Univ., Ithaca, NY (United States)
  24. Instituto Português do Mar e da Atmosfera, I.P. (IPMA) (Portugal)
  25. Japan Agency for Marine-Earth Science and Technology, Yokosuka (Japan)
  26. Univ. of Texas, Austin, TX (United States)
  27. Univ. of Bremen (Germany)
  28. Kyoto Univ. (Japan)
  29. Korea Institute of Geoscience and Mineral Resources (KIGAM) (Korea)
  30. Guilin Univ. of Technology (China)
  31. Shanghai Ocean Univ. (China)
  32. Montpellier Univ. (France)
  33. Univ. of Hawaii at Manoa, Honolulu, HI (United States)
  34. National Institute of Water and Atmospheric Research (NIWA), Wellington 6021, New Zealand.
  35. Univ. of Liverpool (United Kingdom)
  36. Univ. of Oxford (United Kingdom)
  37. Univ. of Florida, Gainesville, FL (United States)
  38. Banaras Hindu Univ. (India)
  39. Univ. of Washington, Seattle, WA (United States)
  40. Chinese Academy of Sciences (CAS), Shandong (China)
  41. Institute for Marine-Earth Exploration and Engineering, Japan Agency for Marine-Earth Science and Technology, Yokosuka (Japan)
  42. Univ. of Auckland (New Zealand)
+ Show Author Affiliations

Slow slip events (SSEs) accommodate a significant proportion of tectonic plate motion at subduction zones, yet little is known about the faults that actually host them. The shallow depth (<2 km) of well-documented SSEs at the Hikurangi subduction zone offshore New Zealand offers a unique opportunity to link geophysical imaging of the subduction zone with direct access to incoming material that represents the megathrust fault rocks hosting slow slip. Two recent International Ocean Discovery Program Expeditions sampled this incoming material before it is entrained immediately down-dip along the shallow plate interface. Drilling results, tied to regional seismic reflection images, reveal heterogeneous lithologies with highly variable physical properties entering the SSE source region. These observations suggest that SSEs and associated slow earthquake phenomena are promoted by lithological, mechanical, and frictional heterogeneity within the fault zone, enhanced by geometric complexity associated with subduction of rough crust.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1769898
Report Number(s):
SAND2020-6726J; 687061
Journal Information:
Science Advances, Journal Name: Science Advances Journal Issue: 13 Vol. 6; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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58 GEOSCIENCES