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Posts Tagged ‘South Sandwich Islands’

M7.1 Quake Strikes N of Bristol Isl, S Sandwich Isls

Posted by feww on December 11, 2018

DBR – 121102

Intermediate-depth earthquake strikes N of Bristol Island, South Sandwich Islands

TSUNAMI EVALUATION:

Based on the depth of the earthquake, a tsunami is not expected. [USGS]

Earthquake Details:

Magnitude: 7.1mww – 48km N of Bristol Island, South Sandwich Islands
Location: 58.598°S, 26.466°W; 164.7 km depth
Time: 02:26:32(UTC) 2018-12-11
[USGS]


Plate-Tectonics Diagnostics

  • FIRE-EARTH Science Plate-Tectonics Diagnostics now available via FIRE-EARTH PULSARS.

FIRE-EARTH EARTHQUAKE FORECASTS

Detailed FIRE-EARTH Forecast for the regions including nearby seismicity available via FIRE-EARTH PULSARS.


 

 

 

 

 

 

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Strong Earthquake Strikes NNE of Visokoi Island, ESR

Posted by feww on May 28, 2016

GBC

M7.2 Quake strikes near Visokoi Island, South Sandwich Islands

Centered at 56.203°S, 26.893°W (58.0km NNE of Visokoi Island, South Georgia and the South Sandwich Islands) the quake struck at a depth of 72.7km (45.2 mi) on 2016-05-28 at 09:46:59 (UTC), reported USGS/EHP.

A destructive tsunami is NOT expected.

CJ Members: Diagnostic Mapping available from FIRE-EARTH BEACONS.

Other Notable Seismicity

M6.6 – 161km SSE of Ndoi Island, Fiji

Location: 22.021°S 178.161°W (321.0 kmWSW of Nuku`alofa, Tonga) depth=416.8 km
Time: 2016-05-28 05:38:51 (UTC)

 

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Bristol Island Volcano Erupts after 60 Years

Posted by feww on May 5, 2016

GYB

Bristol Island Volcano Joins the Global Volcanic  Unrest

Bristol Island volcano, one of South Sandwich Islands group, formed near East Scotia Ridge in Antarctica, is erupting for the first time in 60 years.

Bristol Island is an 8 km long volcanic island in the South Sandwich Islands, located between Montagu Island and Thule Island.

The Island is composed of several active volcanoes with eruptions reported in 1823, 1935, 1936, 1938, 1941, 1950, 1956 and 2016.

bristol island-volcano erupts in antarctica 2

(Landsat 8 satellite imagery – annotated by Culturevolcan)

bristol island-volcano erupts in antarctica

Seismicity in the Region

Powerful quake measuring up to M 7.0 occurred at 58.101°S, 14.867°W, depth of 10km, about 685 km east of Bristol Island, South Sandwich Islands,  on January 05, 2010 at 04:56 UTC.

A powerful earthquake measuring 7.3Mw occurred at a depth of 31km about 216 km SSE of Bristol Island on 15 Jul 2013, according to USGS/EHP.

A cluster of 15 earthquakes measuring ≥ 4.6Mw have struck the East Scotia Ridge since April 8, 2016, with largest event measuring 5.9Mw.

  • M5.9 at 55.626°S, 27.232°W; depth=10.6km, about 119km N of Visokoi Island, South Georgia and the South Sandwich Islands on 2016-04-19 at 05:25:39 UTC.

Latest Global Volcanic Activity

  • Kerinci (Indonesia)
  • Klyuchevskoy Central Kamchatka (Russia)
  • Rincon de la Vieja (Costa Rica)
  • Santa Maria (Guatemala)
  • White Island (North Island, NZ)

Ongoing Activity

  • Alaid (Kuril Islands, Russia)
  • Bagana (Bougainville, PNG)
  • Cleveland (Chuginadak Island, Alaska)
  • Colima (Mexico)
  • Karymsky (E. Kamchatka, Russia)
  • Kilauea (Hawaii)
  • Masaya (Nicaragua)
  • Nevado del Ruiz (Colombia)
  • Sangay (Ecuador)
  • Sheveluch (C. Kamchatka)
  • Sinabung (Indonesia)
  • Tengger Caldera (E. Java)
  • Turrialba (Costa Rica)

Related Links

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M7.8 Quake Strikes Scotia Sea

Posted by feww on November 17, 2013

Quake Likely Generated a Local Tsunami —FIRE-EARTH

The powerful quake follows an earlier shock measuring 6.8Mw which struck Scotia Sea centered at 60.213°S 47.108°W on November 16.

There are No official Tsunami Warnings, Advisories or Watches in effect, as of posting.

Earthquake Details

  • Event Time:2013-11-17  at 09:04:55 UTC
  • Location: 60.296°S 46.362°W
  • Depth: 10.0km (6.2mi)
  • Nearby Cities
  • 893km (555mi) SW of Grytviken, South Georgia and the South Sandwich Islands
    • 1440km (895mi) SE of Ushuaia, Argentina
    • 1686km (1048mi) SE of Punta Arenas, Chile

scotia sea - 17nov2013
Earthquake Location Map. Source: USGS/EHP. Map enhanced by FIRE-EARTH Blog. The quake was followed by at least one significant aftershock, measuring 5.3Mw, as of posting.

Tectonic Summary

The November 17, 2013 earthquake in the Scotia Sea, to the northwest of the South Orkney Islands, occurred as the result of either left-lateral strike slip faulting on an east-west oriented plane, or right-lateral faulting on a north-south plane. The location of the event adjacent to the east-west oriented plate boundary between the Antarctica and Scotia Sea plates implies the left-lateral faulting scenario is most likely. At the latitude of this earthquake, the Antarctica plate moves eastwards with respect to the Scotia Sea plate at a velocity of 6 mm/yr.

The November 17 earthquake is the latest in a series of moderate-to-large earthquakes to strike the same region over the past several days. The sequence began with a M 6.1 event on November 13 approximately 50 km to the west of the November 17 quake. On November 15, a M 6.8 earthquake struck very close to the preceding M 6.1. Since then, 9 aftershocks have been recorded in the area, ranging from M 4.7 to M 5.4, both near the previous earthquakes and in the same approximate location as the November 17 event.

Though the region surrounding the Scotia Sea is familiar with earthquakes, the majority occur around the subduction zone adjacent to the South Sandwich Islands, to the east of the November 17 earthquake. Just two events of M6 or greater have occurred within 250 km of this earthquake over the past 40 years – a M 6.0 230 km to the west in September 1979, and a M 7.6 160 km to the east in August 2003. These two events involved normal and oblique-normal faulting, respectively, associated with the same plate boundary. Neither is known to have caused damage or fatalities. [Source: USGS/EHP]

Details of November 16 Foreshock

  • Time: 2013-Nov-16 at 03:34:31
  • Location: 60.213°S 47.108°W
  • Depth: 10.0km

Related Links

https://feww.wordpress.com/earthquake/#comment-60050

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Powerful EQ Strikes E of Bristol I., SSI

Posted by feww on January 5, 2010

Powerful quake measuring up to M 7.0 strikes E of Bristol Island, South Sandwich Islands

The quake struck at 58.101°S, 14.867°W, about 685 km east of Bristol Island, South Sandwich Islands, at a depth of 10km on Tuesday, January 05, 2010 at 04:56 UTC

Tsunami Evaluation:

NO threat of a destructive widespread tsunami, NOAA/NWS/West Coast and Alaska Tsunami Warning Center said.

  • Earthquake Details:
  • Magnitude:  6.7  [Maximum EQ magnitude estimated at 7.5 Mw by FireEarth]
  • Date-Time
    • Tuesday, January 05, 2010 at 04:55:39 UTC
    • Tuesday, January 05, 2010 at 03:55:39 AM at epicenter
  • Location: 58.101°S, 14.867°W
  • Depth: 10 km (6.2 miles)
  • Region: EAST OF THE SOUTH SANDWICH ISLANDS
  • Distances:
    • 685 km (425 miles) E of Bristol Island, South Sandwich Islands
    • 3660 km (2270 miles) SSW of Cape Town, South Africa
  • Location Uncertainty: horizontal +/- 10.3 km (6.4 miles)
  • Source: USGS NEIC (WDCS-D)
  • Event ID: us2010rcat

10-degree Map Centered at 60°S,10°W


Earthquake location Map. Source: USGS/EHP. Enhanced by FEWW
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Related Links:

Posted in earthquake, earthquake forecast, seismic activity report, seismic hazard report | Tagged: , , , | 2 Comments »