The 1909 Taipei earthquake-implication for seismic hazard in Taipei

Hiroo Kanamori, William H.K. Lee, Kuo Fong Ma

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

The 1909 April 14 Taiwan earthquake caused significant damage in Taipei. Most of the information on this earthquake available until now is from the written reports on its macro-seismic effects and from seismic station bulletins. In view of the importance of this event for assessing the shaking hazard in the present-day Taipei, we collected historical seismograms and station bulletins of this event and investigated them in conjunction with other seismological data. We compared the observed seismograms with those from recent earthquakes in similar tectonic environments to characterize the 1909 earthquake. Despite the inevitably large uncertainties associated with old data, we conclude that the 1909 Taipei earthquake is a relatively deep (50-100 km) intraplate earthquake that occurred within the subducting Philippine Sea Plate beneath Taipei with an estimated M W of 7 ± 0.3. Some intraplate events elsewhere in the world are enriched in high-frequency energy and the resulting ground motions can be very strong. Thus, despite its relatively large depth and a moderately large magnitude, it would be prudent to review the safety of the existing structures in Taipei against large intraplate earthquakes like the 1909 Taipei earthquake.

Original languageEnglish
Pages (from-to)126-146
Number of pages21
JournalGeophysical Journal International
Volume191
Issue number1
DOIs
StatePublished - Oct 2012

Keywords

  • Earthquake dynamics
  • Earthquake ground motions
  • Earthquake source observations
  • Seismicity and tectonics
  • Site effects

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