Earthquakes
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Leading seismologist: California's 'Big One' could trigger super cycle of destructive quakes

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© USGS

A major earthquake - the Big One - is statistically almost certain in California in the coming decades, and there is even worse news below the ground: it is likely to be followed by a series of similar-sized temblors, according to a leading seismologist.

The current relatively quiet seismic period - in which "far less" energy is being released in earthquakes than it is being stored from tectonic plate motions "cannot last forever," said University of Southern California earth sciences professor James Dolan while delivering a new paper during the Seismological Society of America conference in Pasadena.

"At some point, we will need to start releasing all of this pent-up energy stored in the rocks in a series of large earthquakes," Dolan stressed.

The earthquake could spark a "super cycle," meaning "a flurry of other Big Ones, as stresses related to the original San Andreas fault earthquake are redistributed on other faults throughout Southern California," he said.

Comment: Given the amount of tectonic and volcanic activity we've been seeing in the region of the ring fire recently, it may not be decades before we see something absolutely catastrophic occur in California and the surrounding area.

See also:


Hourglass

6.3 earthquake strikes New Zealand

earthquake in NZ April 2015
Image from earthquake.usgs.gov
A strong magnitude 6.3 earthquake has hit 40 kilometers off the New Zealand town of Kaikoura, GeoNet reported. Witnesses described feeling tremors all across central regions of the country.


The quake centered in Nelson region at the depth of 80 kilometers, according to GeoNet. The US Geological Survey, meanwhile, reported a lower magnitude of 5.9 at the epicenter.


There were no immediate reports of any major damage caused by the quake; however, local public transport services were temporarily halted.


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Strong earthquake 5.3 magnitude hits Aleutian Island, Alaska

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© USGS
A moderate earthquake magnitude 5.3 (mg/mb) was reported Friday, 74 kilometers (46 miles) from Buldir Island in Alaska.

The temblor was reported at 02:57:30 / 2:57 am (local time epicenter) at a depth of 55.98 km (35 miles). Global time of event 23/04/15 / 2015-04-23 14:57:30 / April 23, 2015 @ 2:57 pm UTC/GMT. A tsunami warning has been issued near Buldir Island in Alaska, according to the U.S. Geological Survey. Exact location of event, longitude 176.3821 East, latitude 51.7467 North, depth 55.98 km, unique identifier, us200028ka.

Did you feel it?

Leave a comment or report about shaking, activity and damage at your home, city and country. Read more about the earthquake, Seismometer information, Date-Time, Location, Distances, Parameters and details about this quake, recorded in: 74 km SSE of Buldir Island, Alaska.

Bizarro Earth

5.1 earthquake hits just east of Seddo, New Zealand

More tremors are likely following two earthquakes which hit central New Zealand, a GNS scientist says.

Seismologist Dr John Ristau said it was likely there would be more quakes following Thursday's shakes, but it was impossible to say whether they would be stronger or weaker than the 5.1.

"You have to remember this whole area is seismically active to begin with," he said.

"It's likely there's be an aftershock around 4. There's also a chance there'll be something bigger.

"If you think back to July 2013 when those quakes started you first had one around 5, a little bit above 5, and then a couple weeks later was the first of those two 6.6 quakes."

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© Geonet

Comment: Earthquakes around the world for the past month:




Dominoes

Nevado de Ruiz in Columbia volcano shaken by series of earthquakes, ash emissions; volcanic activity reported in Japan

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Nevado del Ruiz - Activity at the volcano has increased during the past week. Accompanied by elevated seismic activity, ash emissions have been occurring since 14 April. The strongest phase of activity was on 19 April, when ash plumes rose to estimated 900 meters above the summit. The Ingeominas volcano observatory in Manizales reported a change in seismicity detected since 12 April, when an increase in volcanic-tectonic (rock-fracturing) signals was detected, signs of pressurization and possible magma intrusion at depth.

Sakurajima (Kyushu, Japan): The volcano has been very active recently. Vulcanian-type explosions have been frequent (2-8 per day) and often relatively large. On 15 April, at least 8 explosions occurred, the largest of which produced ash plumes that rose to 15,000 ft (4.5 km altitude), i.e. 3.5 km above the volcano's summit.

Aso (Kyushu, Japan): Mild strombolian activity with low-level ash emissions continue from the Nakadake crater.

Bizarro Earth

USGS: Earthquake Magnitude 6.3 - 158km SSE of Lata, Solomon Islands

Lata Quake_220415
© USGS
Time
  1. 2015-04-22 22:57:15 (UTC)
  2. Times in other timezones
Nearby Cities
  1. 158km (98mi) SSE of Lata, Solomon Islands
  2. 396km (246mi) NNW of Luganville, Vanuatu
  3. 663km (412mi) NNW of Port-Vila, Vanuatu
  4. 763km (474mi) ESE of Honiara, Solomon Islands
  5. 988km (614mi) N of We, New Caledonia
Scientific Data

Attention

Powerful earthquake hits Taiwan, Japan tsunami warning lifted

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© Taipei Fire DepartmentIn a photo provided by the Taipei Fire Department, vehicles are seen piled on themselves in an automated parking tower after the lift system failed during the 6.3 magnitude earthquake that struck off the island’s eastern coast in Taipei, Taiwan, Monday, April 20, 2015.
One man died and another was hospitalised Monday after a fire caused by a powerful quake off Taiwan that set buildings shaking in the capital Taipei and sparked a short-lived tsunami warning in far southwestern Japan.

Japanese forecasters had warned the 6.6 magnitude earthquake could cause a tsunami as high as 1m affecting several islands in the Okinawa chain. But they lifted the alert around an hour later, with no abnormal waves recorded.

No damage was reported in Japan, but a four-storey apartment building in New Taipei City caught fire after an electrical box outside the block exploded in the quake.

A 65-year-old man who lived in the building "showed no signs of life" at the scene, the fire service said.

Another 18-year-old resident remains in hospital with smoke inhalation but is not in a serious condition, the fire service said.


Bizarro Earth

USGS: Earthquake Magnitude 6.6 - 71km SE of Su'ao, Taiwan

Su'ao Quake_200415
© USGS
Time
  1. 2015-04-20 01:42:58 (UTC)
  2. Times in other timezones
Nearby Cities
  1. 71km (44mi) SE of Su'ao, Taiwan
  2. 76km (47mi) ENE of Hualian, Taiwan
  3. 91km (57mi) SE of Yilan, Taiwan
  4. 125km (78mi) SSE of Keelung, Taiwan
  5. 861km (535mi) ENE of Hong Kong, Hong Kong
Scientific Data

Bizarro Earth

USGS: Earthquake Magnitude 6.5 - 183km SSW of Sigave, Wallis and Futuna

Sigave Quake_170415
© USGS
Time
  1. 2015-04-17 15:52:51 (UTC)
  2. Times in other timezones
Nearby Cities
  1. 183km (114mi) SSW of Sigave, Wallis and Futuna
  2. 224km (139mi) ENE of Lambasa, Fiji
  3. 401km (249mi) NE of Suva, Fiji
  4. 474km (295mi) ENE of Nadi, Fiji
  5. 679km (422mi) NNW of Nuku'alofa, Tonga
Scientific Data

Attention

Two earthquakes (4.8 and 3.8 mag) rock Assam, India within 2 hours

earthquakes in Assam
The Met department put the epicenter at Morigaon and Sonitpur.
Two earthquakes, one measuring 4.8 on the Richter scale and the other 3.8, rocked Assam in a span of about two hours in the early hours of Friday, forcing people to jump out of bed and run outdoors.

While the first tremor, which lasted about seven seconds, was felt at 3:35 AM, it was followed by smaller one at 5:50 AM.

The Met department website put the epicenter of the first earthquake at a place in Sonitpur district at 26.8 N Latitude and 92.7 E Longitude, and that of the second tremor in Morigaon district at 26.3 N Latitude and 92.4 E Longitude. The depth of both the tremors has been put at 10 km.

Geomorphologically located in earthquake zone V of the Indian subcontinent, the Northeastern region is marked as a highly seismic area.

With these, the Northeastern region along with adjoining Bangladesh, Myanmar and Andaman & Nicobar Islands have recorded as many as nine earthquakes in the current month.

Comment: There has been a surge in earthquakes very recently, as Earth continues to 'open up'.