Earth Watch Report - Earthquakes
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M7.3 - 216km SSE of Bristol Island, South Sandwich Islands
2013-07-15 14:03:42 UTC
Event Time
- 2013-07-15 14:03:42 UTC
- 2013-07-15 12:03:42 UTC-02:00 at epicenter
- 2013-07-15 09:03:42 UTC-05:00 system time
Location
60.860°S 25.189°W depth=31.3km (19.5mi)Nearby Cities
- 216km (134mi) SSE of Bristol Island, South Sandwich Islands
- 2596km (1613mi) ESE of Ushuaia, Argentina
- 2841km (1765mi) SE of Punta Arenas, Chile
- 2851km (1772mi) SE of Rio Gallegos, Argentina
- 2233km (1388mi) SE of Stanley, Falkland Islands
Tectonic Summary
The
July 15, 2013 Mw7.3 South Sandwich Islands earthquake occurred as a
result of either east-west left-lateral or north-south right-lateral
strike slip motion at shallow oceanic crustal depths. The earthquake
occurred ~100km east of a complex plate triple junction between the
South America, Antarctica, and Sandwich plates. The South America plate
currently subducts beneath the Sandwich plate at a rate of ~13mm/yr
while sliding past the Antarctica plate with left-lateral motion along
the South Sandwich Fracture Zone at a rate of ~14mm/yr. Given the strike
slip nature and location of the event, the earthquake likely resulted
from relative motion between the South America and Antarctica plates.
Several large earthquakes have occurred along this portion of the plate
boundary, including events of Mw7.4 in January 2006 and Mw7.5 in October
1973.
Contributed by USGS National Earthquake Information Center
Instrumental Intensity
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