Aardbevingen #17

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Op dinsdag 12 mei 2015 23:45 schreef Infection het volgende:
Veel hevige aardbevingen de laatste tijd, voorbode voor een hele grote of is dit normaal?

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Op dinsdag 12 mei 2015 23:51 schreef chufi het volgende:

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En de vulkanen die uitbarsten... Nu de Etna opeens weer actief...

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Op dinsdag 12 mei 2015 23:54 schreef Infection het volgende:

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Klopt. Ligt overigens op een heel ander continent dus ik vraag mij af of er wel een verband is.
Wel toevallig allemaal inderdaad.

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Op woensdag 13 mei 2015 02:01 schreef roislecxe het volgende:
Er zit weer een 8+ aan te komen, alle bekende regio's doen hun best elkaar te overtreffen lijkt het.

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Op woensdag 13 mei 2015 02:04 schreef chufi het volgende:

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Er wordt wel behoorlijk gepushed de laatste tijd...

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Op woensdag 13 mei 2015 11:43 schreef SpeedyGJ het volgende:
http://www.nu.nl/buitenla(...)rikt-aardbeving.html

Naschok? 4 jaar later

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Op woensdag 13 mei 2015 11:47 schreef Drebbelman het volgende:

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Bij grote bevingen (en een van 9 is natuurlijk extreem zwaar) kan er kennelijk idd jaren tussenzitten.

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Op dinsdag 12 mei 2015 23:45 schreef Infection het volgende:
Veel hevige aardbevingen de laatste tijd, voorbode voor een hele grote of is dit normaal?

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Op zaterdag 16 mei 2015 14:12 schreef Frutsel het volgende:

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Tot nu toe zijn er dit jaar zeven aardbevingen geweest van magnitude 7 of hoger.

Gemiddeld per jaar zijn het er ongeveer 15 tot 17... dus we zitten op een normaal schema denk ik

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Megaquake could hit central New Zealand

Scientists finally have proof that central New Zealand could be ticking down to a highly damaging "megathrust" earthquake.

Earlier research has suggested the seabed between the Wairarapa and Marlborough is capable of generating magnitude 7-plus quakes.

Now researchers have found solid geological evidence that an area off the coast of Wairarapa and fringing Cook Strait causes "megathrust" quakes and tsunami similar to, but probably smaller than, the devastating magnitude 9.0 March 2011 event in Japan.

The work, out Tuesday morning, highlights the active threat the southern Hikurangi margin - where the Pacific Plate is being dragged down below the Australian Plate - poses to life and livelihood from Hawke's Bay south to the Wairarapa, Wellington and Marlborough.

The Alpine Fault, which extends further south from that plate boundary, is also a hazardous feature that will generate a magnitude 8 quake when it ruptures, possibly some time in the next 50 to 100 years.

To look for evidence of past earthquakes on the margin, the researchers performed a painstaking examination of the geologic layers contained within a salt marsh at Big Lagoon in the southeastern Wairau River valley on South Island.

The scientists, from GNS Science, the University of Texas and Geomarine Research, have calculated that in the past 1000 years two subduction quakes of at least magnitude 7 occurred – one between about 880 to 800 years ago and the other between 520 and 470 years ago.

This is the first evidence that the southern Hikurangi margin ruptures in large (7-7.9) to great (8+) earthquakes, and the relatively short time interval between the two events has significant implications for seismic hazard in New Zealand," they said in Tuesday's Bulletin of the Seismological Society of America.



They cited an earlier paper that said for a magnitude 8.9 Hikurangi subduction quake, losses in the Wellington region alone were estimated to be about $13 billion, with about 3550 deaths and 7000 injuries.

Their findings would allow better modelling of the impacts and help communities prepare to cope with such an event, they said.

The Hikurangi margin, which runs from east of East Cape to offshore of the Marlborough coast, is one of the few subduction zones around the Pacific that has not generated a "great", above magnitude 8, quake in historic times

Data shows that in the southern Hikurangi margin the Australian and Pacific plates are locked and accumulating strain where they meet, about 25km beneath Wellington and Blenheim.

Previous research suggests this locked patch between Cook Strait and Cape Turnagain could generate a quake of between 8.5 and 8.7 magnitude.

In their search for subduction-quake evidence, the researchers used a salt marsh on the edge of Big Lagoon near Blenheim to recover sediment that could be aged by radiocarbon dating.

They collected 48 sediment cores, from 0.5m to 2.2m deep. Analysis and dating of the buried soils in the cores showed there had been two occasions of sudden subsidence of the lagoon in the past 1000 years, indicative of two large quakes.

The older event was accompanied by a tsunami at least 3.3m high that swept more than 360m inland.

There was no evidence of a tsunami hitting Big Lagoon in the more recent quake, although there were tsunami deposits around Cook Strait, at Abel Tasman and on Kapiti Island about the same time as that event, researchers said.

Lead researcher Dr Kate Clark, of GNS Science, said the findings did not greatly change the actual level of risk to people in central New Zealand.

The National Seismic Hazard Model used a recurrence interval of 550 to 1000 years for a magnitude 8.1-8.4 quake but the researchers had found an actual interval of about 350 years between the two quakes.

While that was different, it was not an irreconcilable difference, given the average was only based on two events.

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Op woensdag 20 mei 2015 14:34 schreef xpompompomx het volgende:
http://www.nu.nl/buitenla(...)scherpen-van-vn.html

Ben benieuwd hoe de VN denkt dat Nepal dit in de afgelegener gebieden, waar ze nog huisjes bouwen van rosten en klei, wil gaan controleren.

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Op woensdag 20 mei 2015 14:59 schreef barthol het volgende:

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Er in Nepal een Organisatie:
National Society for Earthquake Technology-Nepal (NSET) Die er al heel veel jaren mee bezig om er voor te vechten dat er in Nepal aardbevingsbestendiger wordt gebouwd, en die organisatie heeft ook contacten met de locale bevolking in afgelegen gebieden.
Aardbevingsbestendiger bouwen hoeft ook niet duur te zijn, het kan ook met primitieve middelen.

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Op woensdag 20 mei 2015 15:06 schreef xpompompomx het volgende:

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Interessant, even site uitpluizen

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Op woensdag 20 mei 2015 15:06 schreef xpompompomx het volgende:

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Interessant, even site uitpluizen

Feeling the Risks: A Video Documentary by NSET

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Op donderdag 21 mei 2015 01:15 schreef Houtenbeen het volgende:
6,8 bij de Salomoneilanden

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Magnitude ML 4.2
Region ENGLAND, UNITED KINGDOM
Date time 2015-05-22 01:52:16.1 UTC
Location 51.33 N ; 1.33 E
Depth 10 km
Distances 101 km E of City of London, United Kingdom / pop: 7,556,900 / local time: 02:52:16.1 2015-05-22
49 km SE of Southend-on-Sea, United Kingdom / pop: 163,377 / local time: 02:52:16.1 2015-05-22
6 km S of Westgate on Sea, United Kingdom / pop: 6,594 / local time: 02:52:16.1 2015-05-22

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Op vrijdag 22 mei 2015 09:25 schreef Houtenbeen het volgende:
4,2 bij Kent, Engeland

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Op vrijdag 22 mei 2015 20:04 schreef -CRASH- het volgende:

Kent earthquake : Tremor Measuring 4.2 on the Richter Scale Wakes up Residents

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Op zaterdag 23 mei 2015 13:02 schreef Frutsel het volgende:

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kutstem. computer gestuurd ofzo lol

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Magnitude Mw 6.8
Region ALASKA PENINSULA
Date time 2015-05-29 07:00:08.2 UTC
Location 56.78 N ; 156.73 W
Depth 60 km
Distances 2377 km NW of Vancouver, Canada / pop: 1,837,969 / local time: 00:00:08.2 2015-05-29
284 km W of Kodiak, United States / pop: 6,130 / local time: 23:00:08.2 2015-05-28
272 km SE of Dillingham, United States / pop: 2,329 / local time: 23:00:08.2 2015-05-28

twitter:

BuzzFeedNews twitterde op zaterdag 30-05-2015 om 13:43:09 TOKYO (@AP) — Powerful offshore earthquake shakes eastern Japan, but officials say no tsunami threat. reageer retweet

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Op zaterdag 30 mei 2015 14:12 schreef Yi-Long het volgende:
In Japan zelf hebben ze het over een 8.5 ...

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Op zaterdag 30 mei 2015 14:12 schreef Yi-Long het volgende:
In Japan zelf hebben ze het over een 8.5 ...

twitter:

USGS twitterde op woensdag 03-06-2015 om 00:21:05 When is an earthquake not an earthquake? When it is a "Phantom Earthquake" http://t.co/fmAd8CMmqL http://t.co/3eYIuBSHCZ reageer retweet

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Magnitude Mw 6.0
Region HOKKAIDO, JAPAN REGION
Date time 2015-06-08 06:01:09.6 UTC
Location 41.54 N ; 142.05 E
Depth 50 km
Distances 179 km S of Sapporo-shi, Japan / pop: 1,883,027 / local time: 15:01:09.6 2015-06-08
136 km NE of Aomori-shi, Japan / pop: 298,394 / local time: 15:01:09.6 2015-06-08
75 km E of Mutsu, Japan / pop: 49,220 / local time: 15:01:09.6 2015-06-08

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Magnitude Mw 6.0
Region ANTOFAGASTA, CHILE
Date time 2015-06-10 13:52:08.3 UTC
Location 22.44 S ; 68.34 W
Depth 108 km
Distances 495 km SW of Sucre, Bolivia / pop: 224,838 / local time: 09:52:08.3 2015-06-10
250 km NE of Antofagasta, Chile / pop: 309,832 / local time: 10:52:08.3 2015-06-10
54 km N of San Pedro de Atacama, Chile / pop: 2,000 / local time: 10:52:08.3 2015-06-10

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Magnitude Mw 6.8
Region SOUTHERN MID-ATLANTIC RIDGE
Date time 2015-06-17 12:51:31.8 UTC
Location 35.26 S ; 17.79 W
Depth 10 km
Distances 3479 km E of Montevideo, Uruguay / pop: 1,270,737 / local time: 09:51:31.8 2015-06-17
3657 km SW of Windhoek, Namibia / pop: 268,132 / local time: 13:51:31.8 2015-06-17
3682 km E of Buenos Aires, Argentina / pop: 13,076,300 / local time: 09:51:31.8 2015-06-17

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Earthquake warning issued for Reykjavik
The Department for Civil Protection issued a warning on Friday that heightened seismic activity on Reykjanes peninsula, approximately 60 km (37 miles) southwest of Reykjavík, in the past weeks, may lead to an earthquake of up to 6.5 magnitude in the near future.

A 4.0 magnitude earthquake, which hit near Lake Kleifarvatn in late May, could widely be felt in the capital region. A 6.5 magnitude earthquake may cause minor damages to properties and cause rockfalls in caves and mountains, the press release points out.

“Analysis of earthquakes swarms indicates that instability may exist from Kleifarvatn and east to Ölfus. Measuring of movements in the earth’s crust in the past years also indicates that there may be tension in this area, which can lead to larger quakes.”

“Historical information indicates that earthquakes in this area can reach up to magnitude 6.5. Among other events, earthquakes around magnitude 6.0 hit in the Bláfjöll mountain area in 1929 and 1968. These quakes did not cause much damage in the capital region but it should be pointed out that houses have been built much closer to the seismically-active area in the past years.”

“It is to be expected that the impact of an earthquake of this magnitude in nearby communities (the capital region, Grindavík, Þorlákshöfn, Hveragerði and Reykjanesbær) will include that everyone can feel the earthquake, cause many people to be frightened and even evacuate buildings. Heavy furniture may shift and plastering on walls may crack in some places. Otherwise, not much damage is expected in well-built houses.”

The Department for Civil Protection recommends that each home and workplace is reviewed to limit danger in the case of an earthquake. Guidelines on preventive measures and how to respond during an earthquake can be found on the website almannavarnir.is and on YouTube.

twitter:

NewEarthquake twitterde op donderdag 16-07-2015 om 17:32:24 Revised (6.5 -> 6.4): 6.4 earthquake, 116km NE of Bathsheba, Barbados. 2015-07-16 11:16:31 at epicenter (15m a... http://t.co/geEAwSqT8U reageer retweet

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Major quake in Bay Area 'any day now'
(CBS SF) — The fault that produced a 4.0-magnitude earthquake in Fremont early Tuesday morning is expected to produce a major earthquake “any day now” and Bay Area residents should be prepared, a U.S. Geological Survey scientist said.

The 2:41 a.m. earthquake on the border of Fremont and Union City occurred on the Hayward Fault at a depth of 5 miles. The epicenter was at a spot just north of the intersection of Niles Canyon Road and Mission Boulevard.

The quake caused some BART delays early Tuesday while work crews checked the tracks, but appears to have caused no major damage. At least 13 smaller quakes or aftershocks had been reported near the same location as of 6:42 a.m., the largest of which was a 2.7-magnitude at 2:56 a.m.

While damage from the quake was minimal, scientists warn that a much larger one is expected on the Hayward Fault, which extends from San Pablo Bay in the north to Fremont in the south and passes through heavily populated areas including Berkeley, Oakland, Hayward and Fremont.
The last big earthquake on the fault, estimated to have a 6.8-magnitude, occurred in 1868, according to the USGS.
It killed about 30 people and caused extensive property damage in the Bay Area, particularly in the city of Hayward, from which the fault derives its name. Until the larger 1906 earthquake, it was widely referred to as the “Great San Francisco Earthquake.”

“The population is now 100 times bigger in the East Bay, so we have many more people that will be impacted,” said Tom Brocher, a research geophysicist with the USGS.

“We keep a close eye on the Hayward Fault because it does sit in the heart of the Bay Area and when we do get a big earthquake on it, it’s going to have a big impact on the entire Bay Area,” Brocher said.
While a 2008 report put the probability of a 6.7-magnitude or larger earthquake on the Hayward-Rodgers Creek Fault system over the next 30 years at 31 percent, Brocher said the reality is a major quake is expected on the fault “any day now.”

“The past five major earthquakes on the fault have been about 140 years apart, and now we’re 147 years from that 1868 earthquake, so we definitely feel that could happen any time,” Brocher said.
Brocher urged residents to take steps to prepare for a major earthquake.

The USGS shake map shows residents in the areas close to Fremont and Union City experienced light shaking in Tuesday morning’s event, while weaker shaking might have been felt in areas as far south as Santa Cruz, up the Peninsula and as far east as Livermore.
Residents throughout the Bay Area reported feeling the quake, with responses concentrated in the East and South Bay, according to the USGS.

Brocher said Tuesday morning’s 4.0 earthquake was not likely to have much of an impact one way or the other on the likelihood of a major earthquake occurring on the same fault

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Op vrijdag 24 juli 2015 12:15 schreef Peterselieman het volgende:
Dat gaat veel slachtoffers opleveren, maar het is helaas zo dat het wachten is op een paar grote aardbevingen in het westen van de Verenigde Staten

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Mw 7.0
Region PAPUA, INDONESIA
Date time 2015-07-27 21:41:21.6 UTC
Location 2.65 S ; 138.55 E
Depth 50 km
Distances 1215 km NW of Port Moresby, Papua New Guinea / pop: 283,733 / local time: 07:41:21.6 2015-07-28
239 km W of Jayapura, Indonesia / pop: 134,895 / local time: 06:41:21.6 2015-07-28
226 km W of Abepura, Indonesia / pop: 62,248 / local time: 06:41:21.6 2015-07-28

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Magnitude mb 4.4
Region SOUTHERN ITALY
Date time 2015-08-03 07:27:48.8 UTC
Location 39.16 N ; 16.53 E
Depth 26 km
Distances 369 km SW of Tirana, Albania / pop: 374,801 / local time: 09:27:48.8 2015-08-03
30 km N of Catanzaro, Italy / pop: 95,251 / local time: 09:27:48.8 2015-08-03
29 km SE of Cosenza, Italy / pop: 72,998 / local time: 09:27:48.8 2015-08-03

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Magnitude ML 3.0
Region FRANCE
Date time 2015-08-06 10:43:24.7 UTC
Location 49.03 N ; 2.61 E
Depth 5 km
Distances 27 km NE of Paris, France / pop: 2,138,551 / local time: 12:43:24.7 2015-08-06
2 km SW of Moussy-le-Vieux, France / pop: 1,102 / local time: 12:43:24.7 2015-08-06

twitter:

AFP twitterde op donderdag 17-09-2015 om 01:14:09 #BREAKING Tsunami alert issued for Chile after strong quake: official reageer retweet

twitter:

NewEarthquake twitterde op donderdag 17-09-2015 om 01:12:57 Preliminary: 6.5 earthquake, Brazil. On 2015/09/16 22:57:49 UTC (15m ago, depth 10km). http://t.co/o5sdg8CZRV reageer retweet

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Op donderdag 17 september 2015 01:10 schreef tralalala het volgende:
7.9 in Chili

twitter:

NewEarthquake twitterde op donderdag 17-09-2015 om 01:26:00 Revised (7.9 -> 8.3): 8.3 earthquake, 55km W of Illapel, Chile. 2015-09-16 19:54:31 at epicenter (31m ago, dep... http://t.co/gbdHEZSvIX reageer retweet

twitter:

NewEarthquake twitterde op donderdag 17-09-2015 om 01:30:49 Preliminary: 7.1 earthquake, Near Coast of Central Chile. On 2015/09/16 23:18:50 UTC (11m ago, depth 113km). http://t.co/v9B7yEtruR reageer retweet

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Op donderdag 17 september 2015 01:15 schreef Houtenbeen het volgende:

twitter:

AFP twitterde op donderdag 17-09-2015 om 01:14:09 #BREAKING Tsunami alert issued for Chile after strong quake: official reageer retweet

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Op donderdag 17 september 2015 08:06 schreef Frutsel het volgende:
Loopt met een sisser af?

Het was ook al erg 'rustig' op het gebied van aardbevingen. Chili is wel wat gewend

Zag wel dat er doden waren en er golven van 4 meter waren?

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'Aardbeving kan 1.000 kilometer verderop naschokken veroorzaken'

Aardbevingen kunnen naschokken veroorzaken in gebieden die honderden kilometers van het epicentrum af liggen, zo blijkt uit een nieuwe studie.
Specifieke seismische golven in de aardkorst die ontstaan bij een aardbeving kunnen breuklijnen tot in de verre omgeving instabiel maken.

Daardoor kunnen er tot op ongeveer duizend kilometer afstand van het epicentrum aardplaten uit elkaar gaan bewegen, zodat er nieuwe bevingen ontstaan.

Dat melden onderzoekers van de Universiteit van Napels in het wetenschappelijk tijdschrift Physical Review Letters.

Energie

Wetenschappers vermoedden al langer dat aardbevingen kunnen zorgen voor naschokken in gebieden die relatief ver van de rampplek af liggen. Dat gebeurde bijvoorbeeld na zware aardbevingen in Japan in 2011 en in Chili in 2014.

De Italiaanse wetenschappers besloten een computermodel te ontwikkelen om meer inzicht te krijgen in de processen die dit soort naschokken veroorzaken.

“We vroegen ons af: hoe kan een seismisch golfje met een kleine amplitude een aardbeving veroorzaken die zich duizend kilometer van het epicentrum voltrekt", aldus hoofdonderzoekster Lucilla de Arcangelis op nieuwssite New Scientist.

Toeval

Uit de simulatie blijkt dat vooral de frequentie van seismische golven een grote rol speelt bij het ontstaan van de 'verre' naschokken. Elke breuklijn is volgens hoofdonderzoekster De Arcangelis door de vorm en ligging gevoelig voor een seismische golf met een bepaalde frequentie.

"Als er toevallig een signaal binnenkomt met deze frequentie, is er een verhoogd risico dat deze breuklijn een aardbeving zal ontketenen", verklaart ze.

Waarschijnlijk zorgen de specifieke seismische golven voor trillingen van minieme stukjes rots in de breuklijnen. Deze vibraties verminderen de wrijving tussen de aardplaten aan weerszijden van de breuklijn en verhogen daardoor de kans dat ze uit elkaar gaan bewegen, zodat er een beving ontstaat.

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Op donderdag 6 augustus 2015 13:03 schreef Frutsel het volgende:
Kleine beving bij Parijs

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[ afbeelding ]

twitter:

NewEarthquake twitterde op donderdag 24-09-2015 om 18:07:01 6.9 earthquake, 29km N of Sorong, Indonesia. 2015-09-25 00:53:32 at epicenter (13m ago, depth 64km). http://t.co/WrcUAggyDZ reageer retweet

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Op vrijdag 24 juli 2015 15:06 schreef Olga het volgende:

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Het is idd wachten op de Big One.

Ik wil niet eens denken aan hoeveel slachtoffers er dan zullen vallen.........

twitter:

PetraGelderloos twitterde op woensdag 30-09-2015 om 20:21:37 De ramen trilden! Aardbeving van 3.1 in omgeving Hellum http://t.co/8AKwKTr3qZ reageer retweet

twitter:

Joennah twitterde op woensdag 30-09-2015 om 20:15:29 Was zo heftig dat ik er wat angstig van ben geworden. Shake nog helemaal. Snap nu een stuk beter de angst van de Loppersumsters. #aardbeving reageer retweet