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Earthquakes

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Japan's 11 March mega-quake shifted the ocean floor sideways by more than 20m

Image
Japan's 11 March mega-quake shifted the ocean floor sideways by more than 20m (65ft), according one instrument placed on the seabed off the nation's coast. This direct measurement exceeds the displacement suggested by some models built only from data gathered on land.

The figure was recorded by the Japan Coast Guard which maintains underwater geodetic equipment along the fault responsible for the giant tremor. An upwards movement of 3m (10ft) was registered by the same instrument. The data underlines once again the colossal nature of the Magnitude 9.0 quake and its associated tsunami.

The scale is almost double that estimated only from the terrestrial data. Results show how important offshore data are to know where and to what extent the rupture occurred on the plate boundary.

Bizarro Earth

Kermadec Islands - Earthquake Magnitude 6.1

Kermadec Quake_210511
© USGS
Earthquake Location.
Date-Time
Saturday, May 21, 2011 at 21:17:00 UTC

Sunday, May 22, 2011 at 09:17:00 AM at epicenter

Time of Earthquake in other Time Zones

Location
30.775°S, 178.133°W

Depth
19.8 km (12.3 miles)

Region
KERMADEC ISLANDS, NEW ZEALAND

Distances
103 km (64 miles) NE of L'Esperance Rock, Kermadec Islands

169 km (105 miles) S of Raoul Island, Kermadec Islands

942 km (585 miles) NE of Auckland, New Zealand

1108 km (688 miles) SSW of NUKU'ALOFA, Tonga

Bad Guys

Volcano erupts in Iceland, spurs 50 quakes

White plume shoots 18,000 feet above the glacier that sits over the volcano
Image
© Photographers Direct
Grimsvotn volcano
Reykjavik, Iceland - Iceland's most active volcano erupted Saturday, with a white plume shooting 18,000 feet into the air, scientists said.

The eruption was followed by around 50 small earthquakes, the largest of which measured 3.7 on the Richter Scale, according to Iceland's meteorological office.

There was a similar eruption at the same volcano in 2004.

Scientists don't believe this eruption will lead to air travel chaos like that caused by ash from the Eyjafjallajokul volcano in April 2010.

The Grimsvotn volcano is located underneath the Vatnajokull glacier in southeast Iceland.

Sparsely populated Iceland is one of the world's most volcanically active countries and eruptions are frequent.

They often cause local flooding from melting glacier ice, but rarely cause deaths.

Last year's Eyjafjallajokul eruption left millions of air travelers stranded after winds pushed the ash cloud toward some of the world's busiest airspace and led most northern European countries to ground all planes for five days.

In November, melted glacial ice began pouring from, signaling a possible eruption. That was a false alarm but scientists have been monitoring the volcano closely ever since.
Image
© Unknown
Grimsvotn Volcano Area - Iceland.

Bizarro Earth

Australia: Earthquake Magnitude 4.6 - Western Australia

Image
© USGS
Date-Time:
Friday, May 20, 2011 at 20:03:27 UTC

Saturday, May 21, 2011 at 04:03:27 AM at epicenter

Location:
23.412°S, 119.324°E

Depth:
12 km (7.5 miles)

Region:
WESTERN AUSTRALIA

Distances:
1008 km (627 miles) NNE (21°) from Perth, Australia

1779 km (1105 miles) SSW (201°) from DILI, East Timor

Bizarro Earth

Turkey: Earthquake Magnitude 6.0 - Western Turkey

Image
© USGS
Date-Time:
Thursday, May 19, 2011 at 20:15:23 UTC

Thursday, May 19, 2011 at 11:15:23 PM at epicenter

Time of Earthquake in other Time Zones

Location:
39.115°N, 29.124°E

Depth:
4.6 km (2.9 miles) (poorly constrained)

Region:
WESTERN TURKEY

Distances:
53 km (32 miles) NNW of Usak, Turkey

82 km (50 miles) WSW of Kutahya, Turkey

120 km (74 miles) S of Bursa, Turkey

332 km (206 miles) WSW of ANKARA, Turkey

Bizarro Earth

Frequency of Tremors on the Rise in Guerrero

Acapulco,- So far in the month of May, 60 tremors have been registered in Guerrero, mostly in the Richter range of 3 or 4. Monday afternoon a tremor of 4.3 was felt and an earlier one of 5.5 was registered on May 5 with the same epicenter, in the municipality of Ometepec, in the Costa Chica, to the east and south of Acapulco. More than one-third of the tremors taking place in this month in Guerrero have had their origin in the Costa Chica.

Five tremor epicenters have occurred within the municipality of Acapulco since May 1, all of them between 3 and 4 on the Richter scale. The tremors felt in Guerrero in the first two weeks of May is double the number registered for the same period last year.

Info

Philippines: 144 quakes at Bulusan in last 24 hours

Alert level 1 remains at Bulusan Volcano in Sorsogon after state volcanologists noted a significant rise in seismic activity in the area, recording 144 volcanic quakes there in the last 24 hours.

The Philippine Institute of Volcanology and Seismology (Phivolcs) said 80 of these quakes were recorded in a seven-hour period on Monday, from 5:00 a.m. to noon.

Bizarro Earth

Papua New Guinea - Earthquake Magnitude 6.5 - Bougainville Region

Papua Quake_150511
© USGS
Earthquake Location
Date-Time:
Sunday, May 15, 2011 at 18:37:10 UTC

Monday, May 16, 2011 at 04:37:10 AM at epicenter

Location:
6.157°S, 154.446°E

Depth:
43.2 km (26.8 miles)

Region:
BOUGAINVILLE REGION, PAPUA NEW GUINEA

Distances:
122 km (76 miles) W (273°) from Arawa, Bougainville, PNG

248 km (154 miles) WNW (283°) from Chirovanga, Solomon Islands

331 km (206 miles) SE (131°) from Rabaul, New Britain, PNG

709 km (441 miles) WNW (301°) from HONIARA, Solomon Islands

825 km (513 miles) E (86°) from Lae, New Guinea, PNG

Bizarro Earth

Central Mid Atlantic Ridge - Earthquake Magnitude 6.0

Atlantic Quake_150511
© USGS
Earthquake Location
Date-Time:
Sunday, May 15, 2011 at 13:08:12 UTC

Sunday, May 15, 2011 at 11:08:12 AM at epicenter

Location:
0.461°N, 25.601°W

Depth:
10 km (6.2 miles) set by location program

Region:
CENTRAL MID-ATLANTIC RIDGE

Distances:
1276 km (793 miles) ENE (57°) from Natal, Brazil

1624 km (1009 miles) S (188°) from PRAIA, Cape Verde

Radar

New Zealand: Aftershocks Continue Daily after Christchurch Earthquake 2011

Image
© Debbie Roome
The Back View of Buildings on High St after Christchurch Earthquake 2011
A series of aftershocks woke a number of Christchurch residents in the early hours of Sunday 15th May, 2011.

Aftershocks continue to rattle Christchurch on a daily basis with 7 occurring between 4pm on the 14th May and 3pm on the 15th May. Some of these shocks relate to the 7.1 September 2010 earthquake and others to the 6.3 February 2011 earthquake.

Aftershocks on the 15th May 2011

According to the Geonet website, Christchurch was shaken by 3 large aftershocks between 1am and 3am on Sunday 15th May. The first was a 4.0 magnitude centered near Springston. This aftershock was close to the area of the September 2010 earthquake. The second and third aftershocks measured 4.6 and 4.0 and both were in the ocean off the East Coast. They were centered just over 20 kilometers from Cathedral Square in Christchurch central.

These aftershocks disturbed many people's sleep and Facebook comments reported that frightened children ran and climbed into bed with parents. Other people described the tremors as a good shake and shudder. One person said their windows rattled and there was also a comment about chairs on wheels moving.