Earth ChangesS


Bizarro Earth

The Geoscience behind the Mt. Ontake eruption

The eruption started at 11:53 am Saturday local time. A live webcam installed at Takigoshi captured a pyroclastic flow chasing down the south face of the volcano. Japan Broadcasting Corporation NHK released aerial video of the eruption available here, another video including people on a ridge with the glowering ash tower, and a different vantage point before aerial footage here:


Japan is at a triple-plate subduction boundary between the Eurasian continental plate and the Philippine and Pacific oceanic plates. As the denser oceanic plates dive below the low-density continental plate, water from the saturated sediments lowers the melting point of surrounding rock. That magma feeds a range of volcanoes mirroring the plate boundary.
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© Volcano World

Attention

Elephant tramples woman to death in India

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© Satish Hanumantha RaoElephant Charging
A 40-year-old woman was trampled to death by an elephant near Madukkarai in Coimbatore district on Wednesday.

According to police, the woman, S Nagamani from Ayyarthottam area in Madukkarai, was in a grove near the village collecting herbs in the evening when the elephant attacked her.

"Nagamani did not notice the elephant approaching her until it was too late," said a police officer. She raised an alarm and tried to flee from there but was trampled by the elephant. Villagers, who rushed to the grove on hearing her cries, chased the elephant away. They admitted her at the hospital but doctors declared her brought dead.

Attention

Man killed by bear in India

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A man was killed when a bear attacked him on Tuesday morning in Rolla mandal of Anantapur district. DFO P.S. Raghaviah said K. Govindappa had gone for a call of nature when he was attacked by a bear on the outskirts of Vannenahalli village.

A farmer Chennam Lakshminarayana Reddy was fatally attacked by a wild boar in his agricultural field at Kamanuru in Proddatur mandal on Tuesday. .

Attention

Flashback Slovakia records 2 bear attacks on people during May and June

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© Andrew KellyBrown Bear, Slovakia
A bear attacked a man, aged 45, and wounded his head on a street of the Slovak mountain resort Tatranská Lomnica, east Slovakia, last night, the country's daily Čas writes today.

The rescuers drove the wounded man to the hospital in Poprad. He was treated there and then released to recuperate at home, the hospital spokeswoman said.

Experts estimate the number of bears in Slovakia at between 700 and 900. They mostly live in the mountains of central and eastern Slovakia.

This past May, a bear attacked a man in the same region, in the town of Ždiar, a few kilometers to the north. The man, 42, suffered multiple injuries and also had to be taken to the Poprad hospital.

Source: Czech News Agency

Attention

Man killed and eaten by 'hungry' bear in Siberia

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A married couple in the Tomsk region was attacked by a bear while walking their dog Sunday afternoon, and only the wife survived.

"The married couple went to the district near the airport to walk their dog, where a bear attacked them. The man died, and the woman was taken to a hospital in serious condition. The animal also tried to kill her, it bit her limbs," Viktor Ivanov, a local park ranger, was cited as saying by online news portal Tomsk.ru.

The bear was tracked down a couple of hours after the attack and shot dead, Ivanov was cited as saying.

"Now we are trying to determine whether or not any force had been used against it earlier, whether it was injured, or provoked in any way," Ivanov said. Most likely, he said, the bear had just been hungry.

"The bears haven't managed to store up enough fat in time for their hibernation, they're hungry, and they use any opportunity to find nourishment. That's why we recommend that people avoid going into the forest," Ivanov told Tomsk.ru.

This marks the first death from a bear attack in the Tomsk region this year.

Butterfly

No big surprise: Butterflies feeding on leaves with Fukushima radiation dying sooner

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© J.M.Garg, Wikimedia CommonsPale Grass Blue Butterfly
Leaves collected one year after the Fukushima nuclear disaster from surrounding regions had sufficient radioactive toxins on them to cause butterflies to die earlier and have deformed offspring. This is the dire conclusion of a study conducted by scientists of the Universities of Rukyus (Okinawa) and Nagasaki. The study is published in the open access journal BMC Evolutionary Biology.

Researchers fed groups of pale blue grass butterflies (Zizeeria maha) leaves from six different areas at varying distance from the disaster site. They found that even in comparatively low levels of radiation, there was an observable difference in the butterflies' lifespan, depending on the dose of caesium radiation in their food, which ranged from 0.2 to 161bq/kg. Leaves were collected from six locations situated 59 km to 1760 km from the nuclar disaster site.

Bizarro Earth

Magnitude 5.0 earthquake jolts Catanduane, Philippines

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The Provincial Disaster Risk Reduction and Management Council (PDRRMC) has yet to receive a report regarding possible damage from the magnitude 5.0 earthquake that shook Catanduanes 12:16 a.m. Saturday. PDRRMC in-charge Jerry Beo told the Philippine Daily Inquirer that he has yet to establish communications with local officials in Gigmoto town where the epicenter was located.

The United States Geological Survey (USGS) calculated the epicenter of the quake to be in the vicinity of Barangay (village) Dororian at 13.719 degree north and 124.384 degree east, or around six kilometers south of Gigmoto proper. The island province of Catanduanes is just 200 kilometers west of the Philippine Trench, which has generated large earthquakes in the past.

In the capital town of Virac, many people were roused from their sleep by the earthquake, which they say was preceded by a humming sound. According to subdivision residents Guillermo Castilla and Leo Austero, the shaking was strong enough for them to hear creaking and groaning sounds coming from their houses.

The USGS said earthquakes of this magnitude usually have aftershocks, with the secondary shock waves usually less violent but could be strong enough to do additional damage to weakened structures and may occur in the first hours, days, weeks or even months after the quake.

Bizarro Earth

Update - Mammoth Lakes earthquakes now exceed 1059 in latest seismic swarm

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The Long Valley Caldera is experiencing a large seismic swarm. As magma moves through the earth, it displaces and fractures rock along the way. This movement causes earthquakes that can be recorded with seismometers at the surface of the earth. Seismic monitoring is the most used technique for volcano surveillance. Volcanic earthquakes often provide the initial sign of volcanic unrest. Their signals differ from typical, tectonic, earthquakes because they tend to be found at depths shallower than 10 km, are small in magnitude (< 3), occur in swarms, and are restricted to the area beneath a volcano. Harmonic tremor, or volcanic tremor, is the name for the continuous, rhythmic seismic energy associated with underground magma movement. At Long Valley Caldera, there are currently 61 seismometers that make up the seismic network used to determine earthquake location and energy of movement with time.
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The first instrument was installed in 1974 and additional instruments were added throughout the 1980s and 1990s. Between 2000 and 2003, the seismic network was updated to include additional, more modern instruments. More than 200 more earthquakes have erupted in the area in a 24 hour period. Additionally, some earthquakes were now reported at shallower depths. Rodger Wilson, who is following this area for tens of years, hasn't seen this activity since the 1990′s! We have the impression however that the frequency of the earthquakes has seriously declined the last couple of hours. The seismicity at Mammoth Lakes California has even increased compared to this morning. Below all earthquake epicenters during the last 24 hours. Depth of the hypocenters still at +10 km. Earthquake swarms are a regular phenomenon at Long Valley but nobody knows where the magma will move next. We will have to wait and see if this latest swarm indicates a massive movement of magma and might be an early-warning sign that Long Valley might be moving towards an eruption. The last eruption at the volcano is said to have occurred 700,000 years ago and is long over-due. - ER, USGS, TEP

Comment: Nearly 3 dozen small quakes in 24 hours - Volcanic unrest at Mammoth Lakes?


Alarm Clock

Japan's Mt. Ontake volcano suddenly violently erupts - seven people unconscious, eight seriously injured and more than 250 stranded on the mountain

Mount Ontake
© Reuters/KyodoSmoke rises from Mount Ontake, which straddles Nagano and Gifu prefectures September 27, 2014.
A volcano in central Japan has erupted, sending ash clouds down the mountains' slope for more than 3 kilometers. At least eight people have been injured and aircraft have been forced to divert to avoid the dangerous area.The Ontake volcano on the border of Nagano and Gifu prefectures, 200 kilometers west of Tokyo, started erupting at about 11:53 local time (02:53 GMT), NHK reported, citing Japan's Meteorological Agency.

NHK released a video showing the volcano spewing thick, gray smoke into the air."Seven people were slightly injured and one person suffered serious injuries as a result of the eruption," Makoto Hasegawa of the Nagano prefecture fire department told Reuters."Airplanes are diverting their flying routes to avoid the ash cloud," he added.


Bizarro Earth

Nearly 3 dozen small quakes in 24 hours - Volcanic unrest at Mammoth Lakes?

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© Wally Skalij / Los Angeles TimesIn this 2012 photo, runners take to a trail in the Mammoth Lakes region in California's Eastern Sierra.
Nearly three dozen earthquakes have rattled the Mammoth Lakes region in less than 24 hours as the area continues to experience ripple effects of "volcanic unrest," according to the U.S. Geological Survey. The temblors -- all between magnitude 2.5 and 3.8 -- have struck since 9 a.m. Thursday, with the latest recorded at 1:49 a.m. Friday, according to the USGS. The 3.8-quake occurred at 9:21 p.m. with an epicenter six miles from Mammoth Lakes.

Heightened earthquake and ground uplift activity have been measured at Mammoth Mountain and the Long Valley Caldera over the last few decades. At 11,053 feet, Mammoth Mountain in California's Eastern Sierra is a lava dome complex on the southwest rim of Long Valley Caldera, although eruptions haven't occurred for some 57,000 years. The recent swarm of quakes in and around the mountain is being tied to recent "volcanic unrest" marked by gas emissions, tree die-offs and intrusions of upward-moving sheets of rock, according to the USGS.

USGS data for recent quakes