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Focal mechanisms and magnitude distributions of “off-fault” earthquakes

Focal mechanisms and magnitude distributions of “off-fault” earthquakes. David D. Jackson, Yan Kagan, and Qi Wang, UCLA Stefan Hiemer , ETH Zurich. Focal mechanisms. At each point, assumed moment tensor is weighted sum of those for nearby earthquakes and fault elements

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Focal mechanisms and magnitude distributions of “off-fault” earthquakes

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  1. Focal mechanisms and magnitude distributions of “off-fault” earthquakes David D. Jackson, Yan Kagan, and Qi Wang, UCLA Stefan Hiemer, ETH Zurich

  2. Focal mechanisms • At each point, assumed moment tensor is weighted sum of those for nearby earthquakes and fault elements • Weighting inversely proportional to distance • For moment tensors on faults, weighting proportional to moment rate on fault element.

  3. Earthquake catalog, magnitude 4.7+, 1850 - 2009

  4. Representation of larger events as sums of subevents

  5. Earthquake and fault proximity

  6. Projection of fault surface, and weighting scheme

  7. Focal mechanisms derived from earthquakes and faults, respectively

  8. Optimization of seismicity/fault weighting and smoothing distance

  9. Magnitude distribution for all quakes, and quakes on faultsExpected size limit depends on time window.

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