Depth-varying rupture properties of subduction zone megathrust faults

Thorne Lay, Hiroo Kanamori, Charles James Ammon, Keith D. Koper, Alexander R. Hutko, Lingling Ye, Han Yue, Teresa M. Rushing

Research output: Contribution to journalArticle

250 Citations (Scopus)

Abstract

Subduction zone plate boundary megathrust faults accommodate relative plate motions with spatially varying sliding behavior. The 2004 Sumatra-Andaman (Mw 9.2), 2010 Chile (Mw 8.8), and 2011 Tohoku (M w 9.0) great earthquakes had similar depth variations in seismic wave radiation across their wide rupture zones - coherent teleseismic short-period radiation preferentially emanated from the deeper portion of the megathrusts whereas the largest fault displacements occurred at shallower depths but produced relatively little coherent short-period radiation. We represent these and other depth-varying seismic characteristics with four distinct failure domains extending along the megathrust from the trench to the downdip edge of the seismogenic zone. We designate the portion of the megathrust less than 15 km below the ocean surface as domain A, the region of tsunami earthquakes. From 15 to ∼35 km deep, large earthquake displacements occur over large-scale regions with only modest coherent short-period radiation, in what we designate as domain B. Rupture of smaller isolated megathrust patches dominate in domain C, which extends from ∼35 to 55 km deep. These isolated patches produce bursts of coherent short-period energy both in great ruptures and in smaller, sometimes repeating, moderate-size events. For the 2011 Tohoku earthquake, the sites of coherent teleseismic short-period radiation are close to areas where local strong ground motions originated. Domain D, found at depths of 30-45 km in subduction zones where relatively young oceanic lithosphere is being underthrust with shallow plate dip, is represented by the occurrence of low-frequency earthquakes, seismic tremor, and slow slip events in a transition zone to stable sliding or ductile flow below the seismogenic zone.

Original languageEnglish (US)
Article numberB04311
JournalJournal of Geophysical Research: Solid Earth
Volume117
Issue number4
DOIs
StatePublished - Apr 1 2012

Fingerprint

subduction zone
rupture
Earthquakes
earthquakes
Radiation
earthquake
radiation
sliding
Tohoku earthquake 2011
tremors
fault displacement
Seismic waves
Tsunamis
ocean surface
Chile
seismic waves
plate motion
oceanic lithosphere
plate boundary
lithosphere

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Lay, Thorne ; Kanamori, Hiroo ; Ammon, Charles James ; Koper, Keith D. ; Hutko, Alexander R. ; Ye, Lingling ; Yue, Han ; Rushing, Teresa M. / Depth-varying rupture properties of subduction zone megathrust faults. In: Journal of Geophysical Research: Solid Earth. 2012 ; Vol. 117, No. 4.
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abstract = "Subduction zone plate boundary megathrust faults accommodate relative plate motions with spatially varying sliding behavior. The 2004 Sumatra-Andaman (Mw 9.2), 2010 Chile (Mw 8.8), and 2011 Tohoku (M w 9.0) great earthquakes had similar depth variations in seismic wave radiation across their wide rupture zones - coherent teleseismic short-period radiation preferentially emanated from the deeper portion of the megathrusts whereas the largest fault displacements occurred at shallower depths but produced relatively little coherent short-period radiation. We represent these and other depth-varying seismic characteristics with four distinct failure domains extending along the megathrust from the trench to the downdip edge of the seismogenic zone. We designate the portion of the megathrust less than 15 km below the ocean surface as domain A, the region of tsunami earthquakes. From 15 to ∼35 km deep, large earthquake displacements occur over large-scale regions with only modest coherent short-period radiation, in what we designate as domain B. Rupture of smaller isolated megathrust patches dominate in domain C, which extends from ∼35 to 55 km deep. These isolated patches produce bursts of coherent short-period energy both in great ruptures and in smaller, sometimes repeating, moderate-size events. For the 2011 Tohoku earthquake, the sites of coherent teleseismic short-period radiation are close to areas where local strong ground motions originated. Domain D, found at depths of 30-45 km in subduction zones where relatively young oceanic lithosphere is being underthrust with shallow plate dip, is represented by the occurrence of low-frequency earthquakes, seismic tremor, and slow slip events in a transition zone to stable sliding or ductile flow below the seismogenic zone.",
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Lay, T, Kanamori, H, Ammon, CJ, Koper, KD, Hutko, AR, Ye, L, Yue, H & Rushing, TM 2012, 'Depth-varying rupture properties of subduction zone megathrust faults', Journal of Geophysical Research: Solid Earth, vol. 117, no. 4, B04311. https://doi.org/10.1029/2011JB009133

Depth-varying rupture properties of subduction zone megathrust faults. / Lay, Thorne; Kanamori, Hiroo; Ammon, Charles James; Koper, Keith D.; Hutko, Alexander R.; Ye, Lingling; Yue, Han; Rushing, Teresa M.

In: Journal of Geophysical Research: Solid Earth, Vol. 117, No. 4, B04311, 01.04.2012.

Research output: Contribution to journalArticle

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AU - Lay, Thorne

AU - Kanamori, Hiroo

AU - Ammon, Charles James

AU - Koper, Keith D.

AU - Hutko, Alexander R.

AU - Ye, Lingling

AU - Yue, Han

AU - Rushing, Teresa M.

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AB - Subduction zone plate boundary megathrust faults accommodate relative plate motions with spatially varying sliding behavior. The 2004 Sumatra-Andaman (Mw 9.2), 2010 Chile (Mw 8.8), and 2011 Tohoku (M w 9.0) great earthquakes had similar depth variations in seismic wave radiation across their wide rupture zones - coherent teleseismic short-period radiation preferentially emanated from the deeper portion of the megathrusts whereas the largest fault displacements occurred at shallower depths but produced relatively little coherent short-period radiation. We represent these and other depth-varying seismic characteristics with four distinct failure domains extending along the megathrust from the trench to the downdip edge of the seismogenic zone. We designate the portion of the megathrust less than 15 km below the ocean surface as domain A, the region of tsunami earthquakes. From 15 to ∼35 km deep, large earthquake displacements occur over large-scale regions with only modest coherent short-period radiation, in what we designate as domain B. Rupture of smaller isolated megathrust patches dominate in domain C, which extends from ∼35 to 55 km deep. These isolated patches produce bursts of coherent short-period energy both in great ruptures and in smaller, sometimes repeating, moderate-size events. For the 2011 Tohoku earthquake, the sites of coherent teleseismic short-period radiation are close to areas where local strong ground motions originated. Domain D, found at depths of 30-45 km in subduction zones where relatively young oceanic lithosphere is being underthrust with shallow plate dip, is represented by the occurrence of low-frequency earthquakes, seismic tremor, and slow slip events in a transition zone to stable sliding or ductile flow below the seismogenic zone.

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