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Tue, 19 Nov 2019
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Earthquakes

Seismograph

Shallow magnitude 6.0 earthquake strikes northeastern Taiwan, leaves one dead

quake
An elderly woman in New Taipei apparently died after a magnitude 6.0 earthquake struck northeastern Taiwan at 5:28 a.m. Thursday, according to the city's fire department.

The earthquake, with its epicenter at sea about 36.5 kilometers southeast of Yilan County Hall at a depth of 22.5 km, also caused delays to five south-bound trains operated by Taiwan High Speed Rail Corp., affecting 2,500 passengers.

Shortly after the temblor, President Tsai Ing-wen activated the emergency response mechanism set up after she took office in 2016.

After receiving briefings from the National Security Council, Tsai posted a message on her Facebook and other social media platforms reassuring the public that no major damage or casualties had been reported as a result of the earthquake.


Windsock

Taiwan braces for typhoon hours after M5.9 earthquake strikes

Keelung, Taiwan
© AFP/Hsu Tsun-Hsu
A bird's eye general view of the port of Keelung, where wind and rain warnings have been issued.
A powerful typhoon will hit Taiwan later on Thursday (Aug 8), bringing the risk of landslides and high seas, weather forecasters said, hours after a 5.9-magnitude earthquake struck the island.

Typhoon Lekima, categorised at the strongest typhoon level by Taiwan's weather bureau, was expected to approach off the island's northeastern coast late on Thursday.

It was moving across the ocean in a north-northwesterly direction at 15kmh, weather officials said.

Lekima was carrying maximum winds of 227kmh, as it approaches Taiwan, the weather bureau said.

The bureau issued wind and rain warnings for greater Taipei, the northern port city of Keelung and other northern counties. It also put out a warning to seafarers off the south and east coasts.

Seismograph

7-magnitude quake hits off the coast of Indonesia - 6 dead, over 2,100 displaced (UPDATE)

Indonesia quake
© USGS

A powerful magnitude 7 earthquake struck off Indonesia's island of Sumatra on Friday, prompting authorities to issue a tsunami warning and to order people to evacuate their homes.

The quake hit about 227 km (141 miles) from the city of Teluk Betung on the island at a depth of 59 km (37 miles). Indonesian authorities have warned that the tsunami could reach as high as three meters (10 feet).

"There are some areas at risk of a serious threat of a tsunami that could be as high as three metres," said agency official Rahmat Triyono, as cited by the AFP. "We're still waiting for reports about damage from the quake."

The Indonesian geophysics agency quickly issued a tsunami warning and the country's Disaster Mitigation Agency said that residents on the Banten coast of Java island should "immediately evacuate to higher ground".

Comment: Update: Reliefweb on the 5th of August reports:
According to the National Agency for Disaster Management (BNPB), following the 6.9 M earthquake last week, 6 are dead, 4 injured, and over 2,100 displaced, mostly in Pandeglang (Banten Province) and Bandar Lampung (Lampung Province). In both provinces, BNPB report 600 houses or buildings destroyed or damaged.

No emergency response was declared. Local governments supported by the provincial and national governments provided basic relief assistance.



Seismograph

Earthquake of magnitude 6.1 strikes northwest off Tonga

grapf
© AFP
An earthquake of magnitude 6.1 struck northwest of the South Pacific island nation of Tonga, the United States Geological Survey said on Monday.

There were no immediate reports of damage or casualties from the quake, which the agency said hit at a depth of 49 km (30 miles), about 47 km (29 miles) northwest of the town of Neiafu.

Seismograph

Japan rocked by 6.2 magnitude earthquake off the coast of Fukushima

6.2-magnitude quake
Japan has been struck by a 6.2 magnitude earthquake off the coast of Fukushima where a mega tremor triggered the worst nuclear disaster since Chernobyl eight years ago.

The quake occurred at around 11.30am UK time off the northeastern coast of Japan, about 50 kilometers (31 miles) below the seabed.

After effects were felt in the districts of Fukushima and Miyagi along with the capital city Tokyo, which is around 160 miles away. Authorities say there is no danger of a tsunami, and there were no immediate reports of casualties.


Seismograph

6.8 earthquake strikes central Chile, interrupting speech by President Sebastian Pinera

map quake
© USGS
A 6.8 magnitude earthquake has struck off the coast of Chile around 2:30 pm local time on Thursday. The epicenter was at the depth of about 10 kilometers, according to the US Geological Survey (USGS).

The tremors were strong enough to be felt in the capital Santiago, some 167 kilometers to the northeast.

Footage on social media showed light fixtures and furniture swaying in apartments.


No tsunami warning was issued, and there were no reports of damage or casualties.

Seismograph

Powerful 6.6-magnitude earthquake strikes off Vanuatu, no tsunami warning

grapf
© AFP
A strong 6.6-magnitude earthquake struck near the Pacific island nation of Vanuatu Thursday, the US Geological Survey said, but no tsunami warning was issued.

USGS said the quake hit about 178 kilometres (110 miles) northwest of the capital Port Vila at 2:02 am (1502 GMT Wednesday) at a depth of 179 kilometres.

The Pacific Tsunami Warning Center said there was no tsunami threat from the quake.

Seismograph

An acoustic anomaly in Oklahoma baffles geologists

Acoustic anomaly in Oklahoma
© OKGEOSURVEY
Here the anomaly can be seen at station SC14, boxed in red. It repeated once in this instance, as it usually does (June 26, 2019). (Each horizontal line represents an hour.)
"What is that?" asked Dr. Walter, pointing to the seismograms displayed on a flat screen TV hanging on the wall of the OGS seismic lab. There were a series of red marks that indicate automatic picks by the computer as potential earthquakes.

However, these marks were spaced very regularly, so regularly that at first glance they looked like some sort of mechanical noise.

The problem with that assumption was that they were showing up on stations all across the state, all at the same time. Anything that widespread is usually associated with a correspondingly large scale event, like an earthquake.

This pattern we were seeing looked nothing like an earthquake, or even a series of earthquakes. Other potential causes we guessed at were military aircraft, meteor shower, or something related to gas pipelines. We dubbed this acoustic pattern 'The Anomaly.'

Curious about what we were seeing, and what our sensors were hearing, we attempted to locate a potential source for individual pulses from the pattern.

This produced nothing but garbage location potentials with errors so high it was useless. We also attempted locating a source using the first arrival time of the pattern at various stations where it was clearly discernible.

This yielded a more interesting result. It still failed to yield a location, however, by plotting out the first arrival times on a map, the anomaly arrived in a 'ping pong' like pattern back and forth across the state, mainly in a swath from Tulsa, across OKC and toward Lawton.

Seismograph

Earthquake of magnitude 6.3 strikes near south coast of Japan's Honshu

Epicentre of the 6.3 magnitude
© USGS
Epicentre of the 6.3 magnitude earthquake that struck near the south coast of Japan's island of Honshu early Jul 28, 2019.
An earthquake of magnitude 6.3 struck near the south coast of Japan's island of Honshu early on Sunday (Jul 28), the European earthquake monitoring service EMSC reported.

The estimated population of the area where the earthquake was felt is 30 million inhabitants, EMSC said.

There were no immediate reports of damage or injuries.

Source: Reuters

Info

Ancient apocalypses that changed the course of civilization

Volcano Hekla
© Abraham Ortelius/Wikimedia Commons
The eruption of the Icelandic volcano Hekla may have led to the collapse of multiple thriving Bronze Age societies.
Life, as they say, goes on. Until one day it doesn't. For ancient societies, without the means to predict natural disasters, destruction could often come suddenly and completely by surprise. Below are four of the most devastating natural events in recorded human history, and the societies that they wiped off the map.

The Storegga Slides

Until about 8,000 years ago, the British Isles were a peninsula, joined to mainland Europe by a strip of chalk downs, swamps, lakes and wooded hills. Today, we call this submerged world Doggerland.

Today, fishermen routinely bring up carved bone and antler tools from the Mesolithic hunter-gatherers who lived here. But by the end of the 7th millennium BC, a warming world caused sea levels to rise. The people of Doggerland must have watched with dread as their villages were swallowed up one by one. But one event would turn the slow advance of the sea into an apocalyptic terror.

The edge of the Norwegian continental shelf is an underwater cliff that runs for six hundred miles along the Atlantic Basin. And one autumn day around 6225-6170 BCE, this cliff collapsed. An estimated 770 cubic miles, or over 50 Mount Everests, of rock broke off and slid into the deep ocean. The rubble flow reached a speed of 90 mph underwater.