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Earthquakes
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Attention

Sweden earthquake 'was strongest in 100 years'

Sweden earthquake
© TT
This graph shows the moment of impact in Hassela, which is 13 kilometres from the earthquake's epicentre.
An earthquake measuring 4.1 on the Richter scale shook parts of central Sweden on Monday and experts have revealed it was the strongest in a century.

The quake hit in the afternoon between the towns of Mora and Sveg.

"There was a bloody great bang, it was like a bomb," Åke Hedman near Ljusdal told the Aftonbladet newspaper. "It was as if there was a lightning bolt directly above me - only ten times worse," the 57-year-old added.

Björn Lund, a seismologist at Uppsala University, said the earthquake is the strongest Sweden has seen since 1904 when an area by the Koster islands was hit by an earthquake measuring 5.5 on the scale.
Map

No damage, no tsunami after 7.1 Guam earthquake

guam earthquake
An earthquake struck today just off the island of Guam.

The earthquake, which hit at about 4:30 p.m. ChST, was measured at 7.1 magnitude by the U.S. Geological Survey.

It hit about 21 miles northwest of Piti village, 22 miles northwest of Hagatna, 24 miles northwest of Tamuning-Turnon-Harmon Village, 25 miles west-northwest of Dededo Village, and 26 miles northwest of Mangilao Village.

It hit at a depth of 106.9 miles.

The Pacific Tsunami Warning Center, which is run by the National Weather Center, issued an alert right after the quake hit. "A destructive tsunami was not generated because this earthquake is located too deep inside the earth," it said.

On the other hand, the U.S. Geological Survey said that people should expect aftershocks. "These secondary shockwaves are usually less violent than the main quake but can be strong enough to do additional damage to weakened structures and can occur in the first hours, days, weeks, or even months after the quake," it said.
Bell

USGS: Earthquake Magnitude 7.1 - 44km NW of Piti Village, Guam

Earthquake 7.1 Guam
© USGS
Event Time
2014-09-17 06:14:46 UTC
2014-09-17 16:14:46 UTC+10:00 at epicenter

Location
13.740°N 144.394°E depth=133.9km (83.2mi)

Nearby Cities
44km (27mi) NW of Piti Village, Guam
50km (31mi) NW of Tamuning-Tumon-Harmon Village, Guam
54km (34mi) WNW of Dededo Village, Guam
54km (34mi) NW of Mangilao Village, Guam
48km (30mi) NW of Hagatna, Guam

Scientific data
Bizarro Earth

More big 'Ring of Fire' quakes likely, say scientists

Earthquakes
© xiefei/istockphoto
The findings are based on a new earthquake risk assessment method.
The Pacific Ocean's volcanic 'Ring of Fire' could produce more earthquakes of magnitude 9 or greater, say researchers.

Their findings, reported in the Bulletin of the Seismological Society of America, are based on a new way of calculating the probability of an earthquake.

The new research comes in the wake of the 2004 magnitude 9.3 Sumatra-Andaman earthquake which killed over 230,000 people across the Indian Ocean, and the 2011 magnitude 9 Tohoku earthquake which devastated Japan, claiming almost 19,000 lives.

"The strength of both these earthquakes caught many scientists by surprise," says the study's lead author Dr Yufang Rong, a seismologist with insurer FM Global.

"Almost all past methodologies failed to predict the strength of these earthquakes, so we looked at the problem again."

Existing methods of assessing earthquake risk are based on calculating how often earthquakes of a given magnitude happen along a particular fault line.

All these models are however tied to the limited histories available through earthquake records.
Bizarro Earth

Swedish earthquake shakes parts of Finland

An unusually strong earthquake in central Sweden on Monday was also felt in Finland.
Swedish Earthquake
© Pekka Varis
Neighbouring Sweden is much more mountainous than Finland. Kebnekaise, in the far north, is its highest peak at 2014 metres.
The University of Helsinki's Institute of Seismology says that an earthquake occurred shortly after 4 pm in central Sweden, with a magnitude of 5.2 on the open-ended Richter scale. It says the temblor took place some 10 kilometres under the earth's surface

The institute adds there were a number of observations of the quake in the Pirkanmaa and Satakunta regions of south-western and central Finland. There was also an observation in Vantaa that was likely related to the Swedish quake.
Bizarro Earth

It's not just the magma that could be a problem if Iceland's rumbling Bardarbunga erupts

The red-hot fountains of molten lava, glowing like wildfire, are nothing short of spectacular. Yet they could be ominous portents of things to come. For the second time in four nail-biting years, seismologists in the land of fire and ice, Iceland, are bracing for a monumental volcanic eruption that, once again, threatens to disrupt European air traffic.


Back in 2010, the Eyjafjallajokull volcano, which melted through 200 metres of glacier, sent more than 200 million cubic metres of fine ash billowing almost 10 kilometres into the sky. As a result, several European countries were forced to ground or re-route thousands of flights for several days.
Bizarro Earth

A big chunk of the Sierra Nevada caught fracturing on video

Rock Fracturing
© Screen Capture Youtube
If you like geology, you're used to relying on an active imagination. Most geologic processes occur too slowly to see them play out for yourself. Many of the exceptions are dangerous enough that you might not want a front row seat or are rare enough that the odds of being there to witness them are disheartening. Sometimes, though, the Earth throws us a bone - or in this case, a gigantic slab of granite.

One interesting way that rocks weather and crumble apart is called "exfoliation." Like the skin-scrubbing technique, this involves the outermost layers of exposed igneous or metamorphic bedrock sloughing off in a sheet. Over time, this tends to smooth and round the outcrop - Yosemite's Half Dome providing a spectacular example.
Bizarro Earth

Hidden Napa earthquake faults found by NASA radar

Napa Fault Lines
© NASA/JPL-Caltech/ASI/Google Earth
Ground deformation from the Aug. 24 earthquake in Napa, California. Each color fringe corresponds to deformation of 4.7 inches (12 centimeters).
The Aug. 24 Napa earthquake woke several small, previously unrecognized Napa Valley faults, according to the first results from a high-flying NASA radar instrument.

The magnitude-6.0 Napa earthquake, the biggest to shake northern California in 25 years, injured 170 people and killed one woman, who died from brain bleeding caused by a falling television. Some 800 homes were damaged, and 103 have been deemed too dangerous to enter.

Most of the damage was centered on the West Napa Fault. The U.S. Geological Survey (USGS) found that the West Napa Fault moved a total of 18 inches (46 centimeters) along a 9.3-mile-long (15 kilometers) length, USGS scientist Dan Ponti said Sept. 4 at a USGS earthquake seminar.
Bizarro Earth

USGS: Earthquake Magnitude 6.2 - 122km SE of Modayag, Indonesia

Modayag Quake_100914
© USGS
Event Time
2014-09-10 02:46:06 UTC
2014-09-10 10:46:06 UTC+08:00 at epicenter

Location
0.143°S 125.092°E depth=20.5km (12.8mi)

Nearby Cities
122km (76mi) SE of Modayag, Indonesia
161km (100mi) S of Tondano, Indonesia
165km (103mi) S of Tomohon, Indonesia
175km (109mi) S of Bitung, Indonesia
932km (579mi) N of Dili, East Timor

Scientific Data
Attention

Napa earthquake's bizarre side effect: Creeks flowing again as groundwater rises

Wild Horse Creek
© Michael Macor, The Chronicle
Wild Horse Creek which flows through Green Valley in Fairfield, Calif., suddenly flowing with water after the August 24, 2014 Napa earthquake.
When the ground stopped shaking after a 6.0-magnitude earthquake last month in Napa, California, something really surprising happened next.

Local residents noticed that some creeks, which had previously run dry due to the state's prolonged drought, were filled with water again.

The strange phenomenon occurred in Solano County's Green Valley, according to SFGate.com, and it's believed it was caused by groundwater that was forced up to the surface when the Earth jolted.

At first, water running through the drought area may seem like a good thing, but that may not be the case this time.
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