Earthquakes


Magnet

Scientists studying swarm of earthquakes in Northern Nevada - 5,700 since last July

Image
© University of Nevada-Reno
Nevada regional earthquakes in the last 14 days.
Scientists at the Nevada Seismological Laboratory say there has been a "swarm" of more than 5700 earthquakes in northwestern Nevada since last July. They include 21 4.0 temblors.

In 2008, the community of Mogul, west of Reno, also experienced an earthquake swarm.

Graham Kent is Director of the lab on the University of Nevada-Reno campus. He says the number of tremors in that swarm pales in comparison to this one.

"A magnitude 5.0 was the largest and a couple fours's and a bunch of three's and you look back at it and go 'wow!' that was hardly anything."

Kent said this kind of seismic activity is rare anywhere. He says the location of the swarm, which is below an antelope preserve, makes it a perfect place to study earthquake behavior.

"This is a great petri dish. So, now we have this kind of gold-medal swarm going and it doesn't affect a lot of people. So, what we can learn from this, hopefully we can apply the next time there's a swarm underneath a community."

More than 200 quakes 3.0 and stronger have been measured in the Sheldon National Wildlife Refuge since last July.

Seven of them were 4.5 or stronger.

Comment: Earthquake swarm in Nevada desert intensifying


X

Magnitude 5.1 earthquake shocks Nepal; tremors felt in Delhi, Bihar, West Bengal and Sikkim

The quake rocked areas 15 km southeast of Kodari in Sindhupalchok district of Nepal, reported Xinhua news agency
Image
© Facebook/I Love Siliguri
Tremors were felt in several parts of India after an earthquake hit Nepal on Sunday. The fresh quake struck 89 km east of Kathmandu. According to The National Seismological Centre in Kathmandu, the quake, measuring 5.1 on the Richter scale with the epicentre at Dolakha was recorded at 2.47 pm (local time).

The US Geological Survey in a statement noted that the "earthquake magnitude was 5.0 and it occurred near Namche Bazar at 09:02:09.00 UTC on 23 August, 2015."

The tremors were felt in Delhi, following which people rushed out of their homes. Mild tremors also were felt in parts of Bihar, West Bengal and Sikkim.

A devastating earthquake measuring 7.8 on the Richter scale on 25 April had killed roughly 9,000 people and injured more than 20,000 in Nepal.

Cloud Lightning

Signs of Change: Extreme weather and environmental upheaval in August 2015 (VIDEO)

© HawkkeyDavisChannel/YouTube
Floods and infernos: August has seen flooding and fires in areas all over the world.
Hawkkey Davis' latest video compilation of extreme weather events (and general environmental chaos) from the past month or so.

The Solomon Islands, Alaska's Aleutian Islands, the Bay Area, Indonesia, Queensland and Maryland are rocked by earthquakes; Reunion Island (the site of the alleged MH370 'wreckage' found earlier this month) and Mexico by volcanoes. The Queensland quake was the biggest in a century. Flash floods in Arizona, northwest China, Iran, Pakistan, Florida, India, Myanmar, Colorado, and Argentina. Wildfires in France, Spain, Montana and California. The Dead Sea tourism industry is threatened by unprecedented sinkholes. All this, plus storms, tornadoes, sand, fireballs, record-breaking heat and more!


Comment: See also: SOTT Earth Changes Summary - July 2015: Extreme Weather and Planetary Upheaval


Attention

San Francisco hit by 4.0 earthquake

Image
© USGS
Earthquake magnitude 4 felt in San Francisco bay
The tremor registered a 4.0 magnitude on the Richter scale and woke many California residents with a start this morning

Residents of San Francisco are pretty accustomed to experiencing tremors.

But even the most jaded of Californians were shaken this morning when a 4.0 tremor rocked through the city, waking many locals.

A weatherman was mid-report when the quake struck and was caught on film reacting as the studio clearly shook.

As he tries to steady himself he can be heard saying: "Oh my goodness! We have an earthquake!"

At first he appears slightly amused but as the tremor continues unabated he starts to look more alarmed and adds:

"This is a good one!"


Bizarro Earth

2.5 magnitude earthquake rattles New Jersey, as residents heard 'explosion'-like booms

BERNARDSVILLE—After a 2.5 magnitude earthquake rattled parts of Somerset and Morris early Friday morning, borough residents recounted feeling booming, shaking and hearing what sounded like an explosion.

Patrons and employees of the Bagel Bin in downtown Bernardsville told NJ Advance Media they felt the earthquake early Friday morning, but no one said they'd sustained any damage to their homes or been injured.

Rich Green, a customer, said the earthquake shook his Mendham Road house, which was near the epicenter of the quake.

"It was a huge boom," he said. "The ground was shaking. My wife thought it was thunder, I thought it was some type of explosion."

Abby Chernin, a Bagen Bin employee, said she hadn't heard the earthquake, but her husband had jumped out of bed because of it.

Chernin said she asked her husband, "Are you going to make sure we weren't being robbed?" But, she said, then they realized what had actually happened.

Sari Mazen, another employee, said she, too, had initially thought it was thunder. Mazen said this was her second New Jersey earthquake in recent memory, the last occurring more than two years ago while she was on a beach in Belmar.

Bizarro Earth

USGS: Earthquake Magnitude 6.4 - 180km SE of Gizo, Solomon Islands

© USGS
Time
  1. 2015-08-12 18:49:23 (UTC)
  2. Times in other timezones
Nearby Cities
  1. 180km (112mi) SE of Gizo, Solomon Islands
  2. 221km (137mi) W of Honiara, Solomon Islands
  3. 433km (269mi) SE of Arawa, Papua New Guinea
  4. 832km (517mi) E of Alotau, Papua New Guinea
  5. 833km (518mi) SE of Kokopo, Papua New
Scientific Data

Attention

Swarm of tremors in New Zealand indicates magma may be stirring

Image
© GNS Science/ Erik Klemetti
Earthquakes over the last 3 months in the Okataina region of New Zealand. The Tarawera vent alignment for volcanoes is marked along with the approximate boundary of the Okataina Caldera Complex. Red circles are locations of earthquakes.
Over the weekend, a small earthquake swarm hit in the Okataina Caldera Complex on the north island of New Zealand. The swarm itself only lasted a few hours and generated a few dozen earthquakes, all less than magnitude 3. The swarm was located directly underneath the Waimangu Geothermal Valley, the chain of hot springs, mudpots and geysers left by the 1886 eruption of Tarawera—the last eruption from the Okataina Caldera Complex. That 1886 eruption was an impressive event, creating one of the few, recent basaltic plinian eruptions that spread dark ash all the way into the Bay of Plenty. The Waimangu Valley itself is amazing, even if the world's largest geyser no longer erupts along its length.

Now, why would I bring up a small earthquake swarm in a volcanically active area? Mostly to show how rumbling like this is to be expected anywhere that has recent (and repeated) volcanism. The Okataina Caldera Complex has a multitude of eruptions over the last few thousand years, including the two that I've studied: the Kaharoa (~1300 AD) and Whakatane (5600 years ago). Most of the eruptions since 1886 have been steam-driven explosions that, as we've seen in the past, have little-to-no precursor. However, there is no doubt magma still underneath this area of the Okataina. The current earthquake swarm (which is already over) was located ~5-7 kilometers below the surface, which is likely the depth of the rhyolite magma body that fed the Kaharoa eruption.

Bizarro Earth

Half of population in U.S. vulnerable to earthquakes

Image
© Lucas Jackson / Reuters
California's Antelope Valley freeway passes near folded layers of sediment above the San Andreas Fault near Palmdale, California
About 143 million Americans in the 48 contiguous states reside in areas vulnerable to earthquakes, with about nine percent, or 28 million, living in areas with a "high potential" for hazardous quakes.

Around 18 percent of Americans, or 57 million people, live in areas deemed "moderate" hazard zones, according to a new report published in journal Earthquake Spectra. The study utilized US Geological Survey data to predict which areas of the US were most at-risk.

The numbers are nearly twice that of the latest estimate from two decades ago that found about 75 million people in 39 states were exposed to a possible damaging quake.

The increase is due to an uptick in overall US population and the further concentration of population in especially risky areas like California, according to Mark Petersen, co-author of the study and chief of the USGS National Seismic Hazard Modeling Project. Advanced research methods have also added more earthquake risks, including the Cascadia Subduciton Zone in the Pacific Northwest.

Comment: The fact many studies and reports state that the West Coast is "overdue" for a massive quake should make this new report even more sobering to those who live there. Between San Andreas, Cascadia in the Pacific Northwest, and Yellowstone, there is the potential for a huge amount of damage and suffering if any or all of those at-risk areas experience a massive earthquake.


Bizarro Earth

Earthquake of 6.9-magnitude hits off Solomon Islands

A 6.9-magnitude earthquake struck off the Solomon Islands on Monday but there was no Pacific-wide tsunami warning issued for the tremor-prone region, the US Geological Survey said.

The shallow quake was centred some 186km southwest of Dadali and 214km from the capital Honiara. The Hawaii-based Pacific Tsunami Warning Center, which also measured the quake at 6.9, said "a destructive Pacific-wide tsunami is not expected".

Australian officials estimated the undersea quake at magnitude 6.8 and also said there was no tsunami threat.

"They would definitely have felt it over quite a wide area, over hundreds of kilometres," Geoscience's duty seismologist Hugh Glanville said of residents of the Solomon Islands. "But there shouldn't be a tsunami and hopefully not too much damage," he told AFP.

Bizarro Earth

5.6 magnitude earthquake hits eastern Democratic Republic of Congo, killing two children

A 5.6 magnitude earthquake that struck eastern Democratic Republic of Congo early on Friday killed at least three people, the government spokesman said.

The quake hit 24 miles (40 km) north of Bukavu, not far from the border with Rwanda, at 3:25 a.m. on Friday, said the U.S. Geological Survey, which initially reported the quake at magnitude 5.8.

"There were three deaths - two children in a house in Bukavu. There was also a police officer near the airport," government spokesman Lambert Mende told Reuters.