2017 Valparaíso earthquake sequence and the megathrust patchwork of central Chile
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Abstract
In April 2017, a sequence of earthquakes offshore Valparaíso, Chile, raised concerns of a potential megathrust earthquake in the near future. The largest event in the 2017 sequence was a M6.9 on 24 April, seemingly colocated with the last great-sized earthquake in the region—a M8.0 in March 1985. The history of large earthquakes in this region shows significant variation in rupture size and extent, typically highlighted by a juxtaposition of large ruptures interspersed with smaller magnitude sequences. We show that the 2017 sequence ruptured an area between the two main slip patches during the 1985 earthquake, rerupturing a patch that had previously slipped during the October 1973 M6.5 earthquake sequence. A significant gap in historic ruptures exists directly to the south of the 2017 sequence, with large enough moment deficit to host a great-sized earthquake in the near future, if it is locked.
Suggested Citation
Nealy, J., Herman, M.W., Moore, G., Hayes, G.P., Benz, H.M., Bergman, E.A., and Barrientos, S.E., 2017, 2017 Valparaíso earthquake sequence and the megathrust patchwork of central Chile: Geophysical Research Letters, v. 44, no. 17, p. 8865-8872, https://doi.org/10.1002/2017GL074767.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | 2017 Valparaíso earthquake sequence and the megathrust patchwork of central Chile |
| Series title | Geophysical Research Letters |
| DOI | 10.1002/2017GL074767 |
| Volume | 44 |
| Issue | 17 |
| Publication Date | September 14, 2017 |
| Year Published | 2017 |
| Language | English |
| Publisher | AGU Publications |
| Contributing office(s) | Geologic Hazards Science Center |
| Description | 8 p. |
| First page | 8865 |
| Last page | 8872 |
| Country | Chile |
| City | Valparaiso |