The tsunami source area of the 2003 Tokachi-oki earthquake estimated from tsunami travel times and its relationship to the 1952 Tokachi-oki earthquake
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Abstract
We estimate the tsunami source area of the 2003 Tokachi-oki earthquake (Mw 8.0) from observed tsunami travel times at 17 Japanese tide gauge stations. The estimated tsunami source area (∼ 1.4 × 104 km2) coincides with the western-half of the ocean-bottom deformation area (∼2.52 × 104 km2) of the 1952 Tokachi-oki earthquake (Mw 8.1), previously inferred from tsunami waveform inversion. This suggests that the 2003 event ruptured only the western-half of the 1952 rupture extent. Geographical distribution of the maximum tsunami heights in 2003 differs significantly from that of the 1952 tsunami, supporting this hypothesis. Analysis of first-peak tsunami travel times indicates that a major uplift of the ocean-bottom occurred approximately 30 km to the NNW of the mainshock epicenter, just above a major asperity inferred from seismic waveform inversion.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | The tsunami source area of the 2003 Tokachi-oki earthquake estimated from tsunami travel times and its relationship to the 1952 Tokachi-oki earthquake |
| Series title | Earth, Planets and Space |
| DOI | 10.1186/BF03353066 |
| Volume | 56 |
| Issue | 3 |
| Year Published | 2004 |
| Language | English |
| Publisher | Springer |
| Description | 6 p. |
| First page | 367 |
| Last page | 372 |
| Country | Japan |
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