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Posts Tagged ‘Seismicity’

Oroville Dam: Probability of WCS

Posted by feww on February 14, 2017

  • CJ Members
  • EAC
  • OC Teams

Catastrophic failure: Seismicity and fatigue

[Prepared by FIRE-EARTH Science Team.]

  • Report is available from FIRE-EARTH PULSARS.

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FIRE-EARTH Tectonics Forecast 001204 – UPDATE

Posted by feww on December 9, 2016

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FEWW Tectonics Forecast 001204 – UPDATE 001209 

  • Details of original FORECAST and UPDATE are available from FIRE-EARTH PULSARS.

 

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FIRE-EARTH Tectonics Forecast 001204

Posted by feww on December 4, 2016

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FIRE-EARTH Tectonics Forecast 001204

  • Details of the Forecast are available from FIRE-EARTH PULSARS.

 

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FIRE-EARTH Tectonics Forecast 001124

Posted by feww on November 24, 2016

CJ Members

FIRE-EARTH Tectonics Forecast 001124

  • Details of the Forecast are available from FIRE-EARTH PULSARS.

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U.S. West Shaking Like Jelly

Posted by feww on June 30, 2014

SEISMIC HAZARD
HEIGHTENED GLOBAL SEISMICITY
SCENARIOS 08, 07
.

Intense Waves of Low-level Seismicity Continue to Rattle Western United States

Intensifying waves of low-level seismicity in the western U.S. continue affecting the entire region.

FIRE-EARTH Forecast: Earthquakes could cause significant damage in Utah.

western U-S 7-day eq map 30june 2014
EQ Location Map. 7 Days, All Magnitudes Worldwide – 1,625 earthquakes – Updated: 2014-06-30 @ 02:03:29UTC + 870 earthquakes in map area. Source: USGS/EHP

FIRE-EARTH Earthquake Forecasts for California

FIRE-EARTH Science Team has suspended its research on California seismicity, Japan ditto.


IMPORTANT NOTICE: FIRE-EARTH EQ Forecast

For detailed FIRE-EARTH Earthquake Forecasts tune into UDCCpf daily @ 06:32UTC.


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El Hierro Island Experiencing Intense Seismicity, Inflation

Posted by feww on March 31, 2013

El Hierro moving east, experiencing uplift amid intense seismic activity

Intense seismicity and inflation at El Hierro suggest magma is intruding underneath the tiny volcanic island, the smallest of Canary Islands, located  in the Atlantic Ocean off the coast of Africa (population ~ 10,000).

  • Sharp increase in seismic activity in and around the tiny island (Area: ~ 278 km2) began on March 18, with the largest quake measuring 4.7 on Richter scale, which occurred on Friday.
  • The majority of tremors are occurring at a depth of between 12 and 15 km.
  • The latest geological activities have caused the island to move east and forced the ground to rise by 11 cm at Punta de Orchilla on the western tip of the island.

Map of El Hierro with recent quake epicenters

Recent quakes at El Hierro
Image Credit: AVCAN. AVCAN.ORG was developed by Victor Tapia. Original idea, administration and all rights by Fernando Raja

Recent Seismicity at El Hierro
Histogram of the recent earthquakes at El Hierro 18 -31 March, 2013. Note sharp increase in seismic activity since March 18, 2013. Image credit: AVCAN.

El Hierro - latest quakes
Latest Earthquake at El Hierro. Image credit: AVCAN.

Global Volcano Watch (Source: AVO; HVO; GVP)

New Activity/Unrest:

  • Fuego, Guatemala (Lava fountains rising to 400 m above the crater reported on 20 March, causing 1.5 km long lava stream in the Ceniza drainage).
  • Hekla, Southern Iceland
  • Tungurahua, Ecuador

Ongoing Activity:

U.S. Volcanoes

  • Kilauea, Hawaii  (Hawaii) – Code ORANGE – WATCH
  • Cleveland Volcano (Alaska) – Code YELLOW – ADVISORY

Kamchatka Peninsula

  • Gorely – Code YELLOW
  • Karymsky, Eastern Kamchatka (Russia) – Code ORANGE
  • Kizimen, Eastern Kamchatka (Russia) –  Code ORANGE
  • Tolbachik, Central Kamchatka (Russia)  Code ORANGE
  • Bezymianny – Code YELLOW
  • Sheveluch Central Kamchatka (Russia) – Code ORANGE

Indonesia

  • Batu Tara, Komba Island (Indonesia)
  • Lokon-Empung, Sulawesi
  • Paluweh, Lesser Sunda Islands (Indonesia)

Kurile Islands

  • Snow – Code YELLOW
  • Ivan Grozny – Code YELLOW

Other Volcanoes

  • Bagana, Bougainville (PNG)
  • Popocatépetl, México
  • Sakura-jima, Kyushu (Japan)
  • Santa María, Guatemala

Total: 21 volcanoes

Recent Volcano News

Posted in active volcanoes, Volcano Hazard, Volcano News, Volcano Watch, volcanoes | Tagged: , , , , , , , , , , | Leave a Comment »

The Ghost of L’Aquila Quake

Posted by feww on April 22, 2009

Satellite image of Earth movement during Italy quake

asar-interferogram-over-the-l_aquila-area-2
An Envisat Advanced Synthetic Aperture Radar (ASAR) interferogram interpretation by Italy’s Istituto Nazionale di Geofisica e Vulcanologia (INGV). The large green square represents the Mw 6.3 main shock, the smaller green squares represent the Mw > 5 aftershocks and the black triangles represent GPS stations used for SAR validation. The yellow line east of L’Aquila shows the location of a ~4 km–long alignment of co-seismic surface breaks observed in the field by INGV researchers. This alignment corresponds to a northwest – southeast strip where the spatial fringe rate seems to exceed the limit for interferometric correlation. This may indicate that the fault dislocation reached, or was very close to, the surface along this line. The observed pattern of ground displacement is in very good agreement with the earthquake source mechanism (the ‘beach ball’), confirming that the earthquake source is a normal fault striking 144 degrees (clockwise from north), and dipping to the southwest.

The technique is a sophisticated version of  ‘spot the difference’. InSAR involves combining two or more radar images of the same ground location in such a way that very precise measurements – down to a scale of a few millimeters – can be made of any ground motion taking place between image acquisitions.

Each rainbow band represents about 28 millimeters of ground movements. Credits: INGV. Caption: ESA.

Posted in earthquake, interferogram, seismic activity, seismic event forecast, Seismic Hazard | Tagged: , , , , | Leave a Comment »

Redoubt Update: March 31, 2009

Posted by feww on March 31, 2009

Redoubt Activity – Color Code RED : Alert Level WARNING

Date Time :  March 31, 2009 1330 UTC/ March 31, 2009 0530 AKDT

On 2009-03-31 at 05:28:55 AKDT AVO reported:

Seismicity at the volcano has been low, but remains above background level. Weak tremor and small discrete earthquakes have been observed in the past hour.

Latest Images from AVO


Photograph of impact from the volcanic ash fall out in Nikiski, AK from Redoubt volcano. This plume was generated during the March 28, 15:29 AKDT, 2009 event, and ash fall began at approximately 16:16 AKDT and lasted maybe 5 minutes. Fine ash is resuspended as vehicles drive over the recently deposited ash fall deposit. Picture Date: March 30, 2009 16:45:00 AKDT. Image Creator:  Kristi
Wallace. Image courtesy of AVO/USGS. [Image added March31, 2009]


Photograph of Redoubt Volcano in eruption taken during observation and gas data collection flight on March 30, 2009. View is to the east. Continuous emission of volcanic gas, water vapor, and ash is producing a plume rising to about 15,000 feet above sea level. The haze at left below the drifting cloud is a region of active ash fall. AVO scientists observed ash falling up to 25 miles downwind. Picture Date: March 30, 2009 AKDT. Image Creator: Heather Bleick. Image courtesy of AVO/USGS.
[Image added March31, 2009]


Photograph taken during observation and gas data collection flight on March 30, 2009. Looking east / southeast down into the upper crater rim of Redoubt Volcano.
Picture Date: March 30, 2009 AKDT. Image Creator:  Heather Bleick. Image courtesy of AVO/USGS.


Photograph taken during observation and gas data collection flight on March 30, 2009. Picture Date: March 30, 2009 AKDT. Image Creator: Heather Bleick. Image courtesy of AVO/USGS.


Photograph taken during observation and gas data collection flight on March 30, 2009. Picture Date: March 30, 2009 AKDT. Image Creator: Heather Bleick. Image courtesy of AVO/USGS.


Photograph taken during observation and gas data collection flight on March 30, 2009. Picture Date: March 30, 2009 AKDT. Image Creator: Heather Bleick. Image courtesy of AVO/USGS.


Photograph taken during observation and gas data collection flight on March 30, 2009. Picture Date: March 30, 2009 AKDT.  Looking at the north flank of Redoubt Volcano.
Image Creator: Heather Bleick. Image courtesy of AVO/USGS.


Photograph taken during observation and gas data collection flight on March 30, 2009. Picture Date: March 30, 2009 AKDT. Image Creator: Heather Bleick. Image courtesy of AVO/USGS.


Photograph taken during observation and gas data collection flight on March 30, 2009. Picture Date: March 30, 2009 AKDT.
Looking east at Redoubt Volcano. Image Creator: Heather Bleick. Image courtesy of AVO/USGS.


Photograph taken during observation and gas data collection flight on March 30, 2009. Picture Date: March 30, 2009 AKDT.  Looking at the north flank of Redoubt Volcano.
Image Creator: Heather Bleick. Image courtesy of AVO/USGS.


BSE image showing groundmass, with glass, plagioclase, pyroxene, and oxide microlites. The scale bar is absent here, but the image was collected at 400 X, compared with 100 X from image 17485 [SEE BELOW.]  Picture Date: March 30, 2009. Image Creator: Jessica Larsen.  Image courtesy of the AVO/UAF-GI.


BSE image showing amphibole grain with reaction rim in sample AT-1605. Image Creator: Jessica Larsen.  Image courtesy of the AVO/UAF-GI.


Redoubt 15:29 eruption, 3/28/2009. Picture Date: March 28, 2009 AKDT. Image Creator: Tricia Joy Sadler. Image courtesy of the photographer.


Photograph of lightning from Redoubt’s 1:20 am March 28 eruption, courtesy of Bretwood Higman. Picture Date: March 28, 2009. Image Creator: Bretwood Higman. Image courtesy of Bretwood Higman.

For background information and selection of previous images see:

Posted in Alaska volcanoes, Anchorage, ashfall, redoubt eruption, volcanism | Tagged: , , , | 1 Comment »

Alaska’s Redoubt May Be About to Erupt

Posted by feww on February 1, 2009

Redoubt Activity – Color Code ORANGE : Alert Level WATCH

AVO Report on 2009-01-31  at 22:41:24 [Local Time]

Seismicity remained above background. No new episodes of tremor have been detected in the last two hours.

Oblique photo of Redoubt Volcano taken during an observation flight. Fumarolic activity on the north side of the volcano is associated with the most recent unrest at Redoubt Volcano. View from the south. Picture Date: January 30, 2009 AKST – Image Creator:  Kristi Wallace – Image courtesy of AVO/USGS

Observers from the gas/observation flight today report continued melting at the summit area. Holes in the ice continue to grow exposing more steaming rock. Volcanic gases continue to be detected. Web camera views are currently dark. EoR

A rapidly growing fumarole

Geologists detected a hole in the glacier covering the north side of the Mount Redoubt volcano on Friday. The hole doubled in size within hours, currently estimated at about several acres in size.

location-of-redoubt-volcanoLocation of Redoubt volcano, in relationship to surrounding towns, roads, and other volcanoes. Picture Date: September 26, 2008 – Image Creator:  Janet Schaefer. Image courtesy of the AVO/ADGGS.

The Alaska Volcano Observatory researchers flew close to Drift Glacier and observed  vigorous steam emitted from the hole.  They confirmed Saturday the hole was a fumarole which was rapidly growing larger.

Based on the report, an eruption could occur. Redoubt last erupted in 1990.

AVO has  been recording minor quakes, however,  the frequency of these quakes are lower than the seismic activity that  preceded the last two eruptions in 1989 and 1990.

“We’re looking for an increase of seismicity to match the precursor activity, [however,]  we haven’t seen that yet.” AVO research geologist Kristi Wallace said.

[Note: A fumarole  is an opening in Earth’s  crust, usually near volcanoes, which emits steam and gases including carbon dioxide, hydrogen sulfide, sulfur dioxide, hydrochloric acid.]

FEWW Forecast: An area within approximately 300-km radius of Anchorage would be one of the seismic zones in Alaska to experience continued intense seismic activity this year possibly including a magnitude MW 7.9 or larger quake close to Anchorage  (south of the city, north of Rugged Island).

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Posted in Alaska Volcano Observatory, Anchorage, Drift glacier, Fourpeaked Glacier, usgs | Tagged: , , , , | Leave a Comment »

Lava Signs at Okmok Volcano

Posted by feww on July 26, 2008

Okmok Activity – Color Code RED : Alert Level WARNING

Okmok Volcano Activity Notifications
by AVO

The eruption of Okmok Volcano continued throughout this week with persistent ash emissions rising from 15,000 to 25,000 feet. From July 19 to July 20 the color code was increased to red in response to a more vigorous eruptive episode which produced ash to 30,000 feet. Photographs and an overflight by Alaska Volcano Observatory staff on July 20 and 21 confirmed the existence of multiple vigorous vents on the caldera floor.


Photo of the Okmok eruption, July 24, 2008, taken from Ft Glenn on the east flank of Okmok Caldera. Picture Date: July 24, 2008. credit : Lonnie Kennedy – Source: AVO

Seismicity was characterized by intermittent bursts of volcanic tremor early in the week. This changed to continuous mid-level volcanic tremor on July 23, which persists to the current time. Amplitude of tremor has been generally constant since July 21.

Although there has been little change in the eruption in the past several days, stronger explosive activity could resume at any time with little or no warning.

AVO Weekly Update – 2008-07-25 12:18:38

The eruption of Okmok Volcano continued throughout this week with persistent ash emissions rising from 15,000 to 25,000 feet. From July 19 to July 20 the color code was increased to red in response to a more vigorous eruptive episode which produced ash to 30,000 feet. Photographs and an overflight by Alaska Volcano Observatory staff on July 20 and 21 confirmed the existence of multiple vigorous vents on the caldera floor.

Seismicity was characterized by intermittent bursts of volcanic tremor early in the week. This changed to continuous mid-level volcanic tremor on July 23, which persists to the current time. Amplitude of tremor has been generally constant since July 21.

Although there has been little change in the eruption in the past several days, stronger explosive activity could resume at any time with little or no warning.

Cleveland Activity – Color Code ORANGE : Alert Level WATCH

Cleveland Volcano Activity Notifications

2008-07-25 12:18:38 – Weekly Update by AVO
Based on reports from fishing boats Cleveland Volcano began erupting at approximately 12:00 AKDT (20:00 UTC) on July 21, 2008. This eruptive episode is more intense than that observed over the past several years. Pilot reports and satellite data have documented a persistent low level ash emission from 10,000 to 20,000 feet throughout the week when the volcano was visible through clouds. A large thermal anomaly suggests the presence of an ongoing active lava flow.

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