Aardbevingen #17

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USGSBigQuakes twitterde op donderdag 17-12-2015 om 21:08:40 Prelim M6.4 earthquake near the coast of Chiapas, Mexico Dec-17 19:49 UTC, updates https://t.co/ybEpaieNtu reageer retweet

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NewEarthquake twitterde op maandag 04-01-2016 om 00:12:04 Preliminary: 6.7 earthquake, Myanmar-India Border Region. On 2016/01/03 23:05:16 UTC (6m ago, depth 10km). https://t.co/BQEAzInOWi reageer retweet

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USGSBigQuakes twitterde op maandag 04-01-2016 om 00:24:30 Prelim M6.8 earthquake Manipur, India region Jan-3 23:05 UTC, updates https://t.co/qBCVGL9LPK reageer retweet

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Alarming discovery: Bay Area most dangerous faults may be connected
SAN FRANCISCO (KPIX 5) — Scientists have discovered an alarming connection underwater: Two of the most dangerous earthquake faults in the Bay Area.

Experts long debated whether the Hayward Fault and the Rodgers Creek Fault connected, but now there’s strong evidence they do.

US Geological geophysicist Janet Watt made the discovery in an underwater survey using an acoustic instrument over the San Pablo Bay. She says the data is clearer than ever.

“We now have direct evidence that the faults come closer together in the bay and may be directly connected,” says Watt. “It would be devastating for an earthquake to rupture at both those faults — it’d be a very strong earthquake.”

Two Bay Area fault lines could potentially trigger a 7.3 magnitude earthquake if they ruptured together. That’s stronger than the 1989 Loma Prieta quake.

Buildings standing on landfill were particularly vulnerable to collapse in the shaking. Ground floors wound up subterranean. (San Francisco Chronicle)
Buildings standing on landfill were particularly vulnerable to collapse in the shaking. Ground floors wound up subterranean. (San Francisco Chronicle)
“If these two faults are connected then that means it would be easier for an earthquake to rupture from the Hayward to Rodgers or vice versa,” says Watt.

Old maps showed a gap of at least 2.5 miles between the faults. Watt says the 60-mile long Hayward Fault, which runs from San Pablo Bay to Alum Rock, and the 39-mile Rodgers Creek Fault that runs from San Pablo Bay to Healdsburg, are likely linked by a strand.

LOMA PRIETA STRIKES (1989)

Watt’s discovery may help determine whether a big quake is ahead of us. After all, the Hayward Fault is the most populated fault in the world. A 7.3 magnitude quake would be devastating.

“People in the Bay Area just need to be prepared that they live in earthquake country,” she said.

Now scientists will work to confirm the new data. Watt’s survey will go from underwater to land to see if there is a connection above ground, as well.

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8.2 magnitude earthquake could hit Himalayas soon
New Delhi: MHA experts have warned that earthquakes with a magnitude of 8.0 or more on the Richter scale are likely to hit the Himalayan region.

According to a Times of India report, expert say quakes with higher intensity than the one that struck Manipur on Monday are likely to rock the region in future. The tectonic shift a series of these recent earthquakes have caused in the region — Manipur 6.7 (Jan 2016), Nepal 7.3 (May 2015) and Sikkim 6.9 (2011) — have re-ruptured the plates that had already developed cracks during previous temblors. This has led to conditions which might trigger multiple earthquakes which may go up to 8.0 in magnitude.

Over the past 200 years there have been at least seven major earthquakes in the Himalayan belt – Nepal in 1803, 1833 and 1934; Shillong in 1897; Kangra in Himachal Pradesh in 1905; Assam in 1950; and Kashmir in 2005. In addition, earth scientists have been able to learn about historical earthquakes by using old or paleo-seismological evidences.

Speaking to TOI, NIDM director Santosh Kumar said the interconnected plates across Nepal, Bhutan, Myanmar and India pose a bigger danger, and predicted a disaster of bigger magnitude that awaits hill states and parts of Bihar, UP and even Delhi which fall under the second worst seismic Zone IV classification. The North-East and other hill states fall under severe seismic Zone V.

The report quotes Roger Bilham, the seismologist of University of Colorado and an authority on the subject, saying “the current conditions might trigger at least four earthquakes greater than 8.0 in magnitude. And if they delay, the strain accumulated during the centuries provokes more catastrophic mega earthquakes.”

During an earthquake, subsurface soil is liquefied because of a change in the ambient stress conditions. Evidence of this liquefaction and deformation of sediments caused by the earthquake is obtained by digging trenches and collecting soil/sediment samples. The organic matters like peat etc., found in these sediments, can be dated by radioactive carbon or cosmogenic isotopes to ascertain the time of occurrence of the quake. Using this technique it has been possible to infer the occurrences of major earthquakes in the Himalayas in 1125, 1400, 1505 and 1555.

The Himalayas are one of the youngest and most active mountain belts in the world. The range had resulted from the collision between India and Tibet (Eurasia) around 50 million years ago. The process of convergence continues today with the Indian plate diving beneath the Eurasian plate at a steady rate of ~2 cm/year.

Although the rate is very slow, the process has been continuing steadily over centuries, resulting in accumulation of stresses in subsurface rocks. Once the stress overcomes the frictional barrier within the rock, it ruptures (along a fault) and blocks on either side of the fault slips past each other in a flash, resulting in release of enormous energy.

Part of the energy gets converted into elastic waves, which in turn causes vibration that propagates through the ground. If the vibrations are strong enough, they can cause tremendous destruction. The whole of the Himalayas have several such faults. Our study suggests that the fault across which the current slips occurred is the Main Himalayan Thrust or MHT.

twitter:

pzf twitterde op woensdag 06-01-2016 om 15:47:11 BREAKING NEWS: 4.8 earthquake shakes the Los Angeles area. reageer retweet

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Op woensdag 6 januari 2016 15:52 schreef Frutsel het volgende:
Die worden leuk wakker geschud

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Op woensdag 6 januari 2016 15:53 schreef Houtenbeen het volgende:

[..]

Ze zijn daar ook gewoon een waterstofbom aan het testen

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NewEarthquake twitterde op maandag 11-01-2016 om 18:07:31 Revised (6.9 -> 6.4): 6.4 earthquake, 233km SE of Sarangani, Philippines. 2016-01-12 00:38:05 at epicenter (29... https://t.co/sDtnIWZTuZ reageer retweet

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NewEarthquake twitterde op maandag 11-01-2016 om 18:18:09 Preliminary: 6.2 earthquake, Hokkaido, Japan Region. On 2016/01/11 17:08:03 UTC (9m ago, depth 227km). https://t.co/xozMCUcPwi reageer retweet

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6.1 quake hits street of Gibraltar
Rabat (AFP) - A strong 6.1-magnitude earthquake struck early Monday in the Mediterranean between Morocco and Spain, the US Geological Survey said.

It was followed by a 5.3-magnitude tremor.

In its initial assessment of the quake's impact, the USGS said there was "a low likelihood of casualties and damage".

Tremors were felt in the south of Spain and in the Spanish enclave of Melilla bordering Morocco, but the authorities reported no victims.

"For the moment there has been only material damage and we haven't detected any that is very serious," Isidro Gonzalez, a Melilla official, told Cadena Ser radio.

"Some high buildings have cracks," he said, adding that part of facades and balconies had collapsed.

Authorities in Melilla have decided to keep schools closed as a precautionary measure to review the state of the buildings.

In the Malaga area in southern Spain, on the other side of the Strait of Gibraltar, many inhabitants also felt the earthquake.

In February 2004 a strong 6.3 earthquake that hit near Al Hoceima killed nearly 630 people.

twitter:

EMSC twitterde op vrijdag 05-02-2016 om 21:06:40 #Earthquake (#地震) M6.4 strikes 42 km NE of Kaohsiung (Chinese Taipei) 9 min ago. More info: https://t.co/7dj2OrjZ7O reageer retweet

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RT_com twitterde op vrijdag 05-02-2016 om 21:47:33 BREAKING PHOTO: Aftermath of 6.4 magnitude earthquake in #Taiwan https://t.co/ou1eG1qqjc https://t.co/0yN3gmb9S4 reageer retweet

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noradeut twitterde op vrijdag 05-02-2016 om 22:35:32 HUNDREDS OF RESIDENTS BELIEVED IN ONE OF THE COLLAPSED TAIWAN BUILDINGS -TAIWAN TELEVISION reageer retweet

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BNONews twitterde op vrijdag 05-02-2016 om 22:35:56 BREAKING: 16-story residential building collapsed in Taiwan after earthquake, hundreds feared inside https://t.co/rNsQbfD6DK reageer retweet

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EMSC twitterde op zaterdag 06-02-2016 om 00:11:14 Update: M4.8 #earthquake (#σεισμός) strikes 35 km S of #Ierápetra (#Greece) 10 min ago. https://t.co/iiChy6OGVT reageer retweet

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NewEarthquake twitterde op maandag 08-02-2016 om 17:28:51 6.7 earthquake, 98km WSW of Panguna, Papua New Guinea. 2016-02-09 02:19:15 at epicenter (9m ago, depth 33km). https://t.co/RY9233Cr7g reageer retweet

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EMSC twitterde op dinsdag 09-02-2016 om 00:47:54 Update: M5.3 #earthquake (#terremoto) strikes 1,808 km SW of #Horta (#Portugal) 21 min ago. https://t.co/xgAXbn7YlA reageer retweet

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NZStuff twitterde op dinsdag 09-02-2016 om 01:42:51 #Breaking Magnitude 5.8 #earthquake, 62 km deep, 40km south-east of St Arnaud. More soon #eqnz reageer retweet

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EMSC twitterde op woensdag 10-02-2016 om 01:48:46 #Earthquake (#sismo) M6.4 strikes 73 km SW of #Coquimbo (#Chile) 16 min ago. More info: https://t.co/j0MCoGGtiz reageer retweet

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NZStuff twitterde op zondag 14-02-2016 om 01:17:05 #BREAKING: 5.7 quake 10km east of Christchurch. More to come reageer retweet

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Op zondag 14 februari 2016 01:18 schreef Houtenbeen het volgende:

twitter:

NZStuff twitterde op zondag 14-02-2016 om 01:17:05 #BREAKING: 5.7 quake 10km east of Christchurch. More to come reageer retweet

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USGSBigQuakes twitterde op maandag 15-02-2016 om 20:44:10 Prelim M6.2 earthquake Auckland Islands, New Zealand region Feb-15 19:28 UTC, updates https://t.co/bhdZ16OUhD reageer retweet

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New Zealand cliffs collapse in Christchurch earthquake

Cliffs have collapsed in New Zealand during an earthquake in the city of Christchurch on the South Island.

No serious damage or fatalities were reported in the Valentine's Day quake that struck at 13:13 local time (00.13 GMT).
Beaches to the east of Christchurch were busy with swimmers and surfers when rocks began to fall into the sea.

The 5.7 magnitude quake occurred days before the anniversary of a deadly one in 2011.
That destroyed the city centre and killed 185 people.

New Zealand lies on the notorious Ring of Fire, the line of frequent quakes and volcanic eruptions that circles virtually the entire Pacific rim.

The earthquake, classified as severe, lasted less than 30 seconds

New Zealand's seismological body GNS Science classified Sunday's earthquake as "severe", recording that it took place at a depth of 15km (nine miles) and 15km to the east of the city.
Resident Stephen O'Dwyer said he was on the beach with his wife walking their dog when the cliff in Sumner started to collapse.

"The ground started to go soft. Water was coming up under the sand and people were sinking down to the ankles as the ground went soft. It shook for about 20 seconds," he told the BBC.
The quake sent large clouds of dust billowing over the suburb.

The cliff that collapsed was in the coastal suburb of Sumner

"I have to say that it was business as usual 15 minutes after the fact," said local Richard Loffhagen, who took a photograph of the dust and debris rising from Scarborough Beach.
During the tremor, which was reportedly felt across the South Island, some shops in Christchurch were evacuated and photos on social media showed items that had fallen off shelves.

A Polish couple posted a clip on YouTube showing the cracks their house suffered, saying it was their first experience of an earthquake in Christchurch and they had not expected it to be so intense.

twitter:

NewEarthquake twitterde op woensdag 02-03-2016 om 13:54:08 Preliminary: 8.1 earthquake, Southwest of Sumatra, Indonesia. On 2016/03/02 12:49:50 UTC (3m ago, depth 10km). https://t.co/nypWTZYkKz reageer retweet

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LastQuake twitterde op woensdag 02-03-2016 om 14:05:36 M7.9 #earthquake strikes 805 km SW of #Padang (#Indonesia) 16 min ago. Effects reported by witnesses: https://t.co/mLsTeQSPhm reageer retweet