Determination of earthquake magnitude for early warning from the time-dependence of P-wave amplitudes
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Abstract
We propose a method that utilizes the time dependence of P‐wave displacement amplitudes to estimate the final magnitude (M) for earthquake early warning (EEW) before the arrival of the peak amplitude. A relation between M and P‐wave displacement amplitude is employed for the method. Its value is set as a function of time from the P arrival, and is determined using a K‐NET dataset recorded in Japan from a scaling relation between M and the time dependence of P‐wave displacement. A test to check the performance of the proposed equation demonstrates in a statistical sense that this technique enables us to estimate M more rapidly than conventional methods without loss of accuracy. We conclude that the approach proposed in this article effectively gains a longer lead time as well as reduces the blind zone for EEW.
Suggested Citation
Noda, S., and Ellsworth, W.L., 2017, Determination of earthquake magnitude for early warning from the time-dependence of P-wave amplitudes: Bulletin of the Seismological Society of America, v. 107, no. 4, p. 1860-1867, https://doi.org/10.1785/0120170048.
ISSN: 1943-3573 (online)
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Determination of earthquake magnitude for early warning from the time-dependence of P-wave amplitudes |
| Series title | Bulletin of the Seismological Society of America |
| DOI | 10.1785/0120170048 |
| Volume | 107 |
| Issue | 4 |
| Publication Date | July 04, 2017 |
| Year Published | 2017 |
| Language | English |
| Publisher | Seismological Society of America |
| Contributing office(s) | Earthquake Science Center |
| Description | 8 p. |
| First page | 1860 |
| Last page | 1867 |