Time and size of a giant earthquake in Cascadia inferred from Japanese tsunami records of January 1700

Article Abstract:

The Cascadia subduction zone off the Pacific coast of North America was geologically proven to have experienced great earthquakes in its recent prehistoric past. Although the last earthquake was to have occurred around 300 years ago, no precise date and magnitude were given. The discovery of some tsunami records in Japan from 1700 that had no local source indicated points to Cascadia as the most likely source of the tsunami since no earthquakes were reported in South America, Alaska or Kamchatka at the time. This developement can aid in the possible assessment of future hazards.

Analysis, 18th century AD, Tsunamis

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A wide depth distribution of seismic tremors along the northern Cascadia margin

Article Abstract:

Source-scanning algorithm (SSA) method is used for determining the distribution of episodic surface displacements. SSA identified the distribution of tremors over a depth range exceeding 40 km within a limited horizontal band.

United States, Research and Development in the Physical, Engineering, and Life Sciences, Science & research, Earthquake R&D, Research, Earthquake prediction

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