Geobulletin alpha

News from the Geoblogosphere feed

by Stratigraphy.net
New from Snet: Lithologs, a new tool to create lithological/sedimentological logs online..

Posts treating: "large earthquakes"

Sunday, 27 March 2016

sort by: date | clicks

Oklahoma experiences deep mantle movement 

Ontario-geofish [2016-03-27 13:48:00]  recommend  recommend this post  (147 visits) info

 US
img
A deep M3.6 earthquake indicates lower mantle motion.  More than that - the past few weeks have shown very deep earthquakes, and unusual activity at New Madrid.  Last December, a remarkable series of large earthquakes also rang New Madrid, which is the best strain gauge available in the area. In active areas, these deep strain events happen all the time, and don't mean anything.  But

Digging into the Alpine Fault 

Julian\'s Blog [2016-02-15 01:11:00]  recommend  recommend this post  (180 visits) info

 NZ,US,AU
img
The Alpine Fault has been the focus of a lot of research over recent years, including the Deep Fault Drilling Project, Alpine Lake Sediment Research and the Earthquake Records at Hokuri Creek amongst them. These are building a much clearer picture of the history of previous fault ruptures, and allowing better estimates of the size and likelihood of future earthquakes.The Alpine Fault is a long, straight, geologically  fast moving fault that typically produces very large earthquakes [...]

Seismic risk in eastern Mediterranean higher than previously estimated 

AGU Meetings [2015-12-01 16:20:21]  recommend  recommend this post  (182 visits) info

 GR
The eastern Mediterranean is more seismically active than previously assumed, a new study finds. On a geological time scale, seismic activity around the island of Crete has generated large earthquakes in bursts, potentially increasing the future risk for earthquakes and tsunamis in the

Geosciences Column: Earthquakes and depleted gas reservoirs; what comes first? 

GeoLog-The official blog of the European Geosciences Union [2015-11-20 13:00:04]  recommend  recommend this post  (111 visits) info

 US,IT,PT,
An ever growing population means the requirement for resources to fuel our modern lifestyles grows too. Be it in mining, oil/gas extraction or the improvement of renewable technologies, the boundaries of where and how we access resources are constantly being pushed. Previously inaccessible resources become viable prospects as demand increases and our technological know-how advances. Hand in hand with technological advances, comes an increased awareness of the environment and how it may be [...]

Cascading Earthquakes – Seismic waves can trigger another earthquake 

The Way of the Geophysicist [2015-10-30 12:30:00]  recommend  recommend this post  (182 visits) info
Reading Time: 2 minutes Earthquakes teach us about the interior workings of Earth. Without them, we would not know about the core or any layering deeper than a couple kilometers. Researchers from the Los Alamos National Laboratory, MIT and Earthquake Research Institute Tokyo have now proposed a new triggering mechanism for earthquakes. Triggered earthquakes happen due to a certain […] The post Cascading Earthquakes – Seismic waves can trigger another earthquake appeared first on The [...]

Big Quakes Can Trigger Other Shakes Thousands of Miles Away 

Utah Geological Survey - blog [2015-10-20 00:46:50]  recommend  recommend this post  (164 visits) info

 KM,
An earthquake felt round the world. Research shows that large earthquakes may trigger smaller earthquakes thousands of miles away. smithsonianmag.com On April 11, 2012, an 8.6 magnitude earthquake in the Indian Ocean shook the Sumatran coast. Only a day later—3,900 miles (6,230 km) away—seismologists detected a set of smaller temblors rattling the eastern coast of

ISPRA volume “Earthquake Environmental Effect for seismic hazard assessment: the ESI intensity scale and the EEE Catalogue” 

paleoseismicity.org [2015-05-25 13:04:19]  recommend  recommend this post  (597 visits) info
Earthquake Environmental Effects (EEE) have proven to be valuable for describing past earthquakes and their geological imprints. The ESI2007 is a relatively new intensity scale dedicated to such effects, but also integrating traditional macroseismic scales. Examples of ESI2007 intensities assigned to large earthquakes are being collected in the EEE web catalogue hosted by the ISPRA and ESI2007-related work is conducted in the framework of INQUA. Another milestone now has been achieved with the [...]

Magnitude 7.8-7.9 earthquake strikes near Katmandu, Nepal 

Geology in Motion [2015-04-25 20:31:17]  recommend  recommend this post  (133 visits) info

 NP,CN,KM,IN,CH
img
Location of earthquake and initial aftershocksFrom CNN.comA strong earthquake occurred in Nepal about 14 hours ago, and as I write this the death toll from the earthquake  has risen to 1,457, with more deaths expected.  The people face a cold night without shelter, water or electricity in many regions. The world's thoughts are focused on the people of Nepal with hopes that rescue efforts proceed smoothly an rapidly.           Max Wyss, Switzerland, runs a [...]

New paleoseismology papers 

paleoseismicity.org [2015-01-31 16:27:19]  recommend  recommend this post  (157 visits) info

 Quaternary; IT
It’s been a while since the last update on paleoseismology literature. BSSA’s latest issue has some interesting studies that you should check, and there’s even more to discover. Also, there is some new work on (paleo-)tsunamis and historic large earthquakes. If you feel that important new papers are missing, drop us a mail! Galli, P., Giaccio, B., Peronace, E., & Messina, P. (2014). Holocene Paleoearthquakes and Early–Late Pleistocene Slip Rate on the Sulmona Fault [...]

Global Earthquakes: January – April 2014 

Climate and Geohazards [2014-10-16 12:29:06]  recommend  recommend this post  (96 visits) info
Earthquakes happen every day, and as this animation shows, small ones happen more frequently than moderate-to-large earthquakes. are less common. However, April 2014 was unusual because there were more than the average number of moderate and large earthquakes. The Pacific … Continue reading

Experts discuss likelihood of large earthquake in Utah, offer preparedness tips 

Utah Geological Survey - blog [2014-08-25 19:23:47]  recommend  recommend this post  (102 visits) info

 US
The recent 6 M earthquake in Napa, California, can serve as a large-earthquake preparedness reminder for us Utahans. Utah is earthquake country, and the Wasatch Front is capable of producing large earthquakes. We can’t predict when or where an earthquake will happen, but we can prepare to the best of our abilities. This article has a

Drilling into New Zealand's most dangerous fault 

Julian\'s Blog [2014-06-24 05:37:00]  recommend  recommend this post  (824 visits) info

 NZ,SG
The Alpine Fault forms the plate boundary in New Zealand's South Island, and is a very significant fault on a global scale. It last ruptured in 1717 AD and appears to produce large earthquakes on average every 330 years. Its next rupture has a high probability (28%)  of occurring in the next 50 years.Each time the Alpine Fault ruptures, there is roughly 8 metres of sideways movement and about 1 to 2 metres of vertical uplift on the eastern side. These magnitude 8 (M8) earthquakes can [...]

Chile earthquake and tsunami on April 1 

Geology in Motion [2014-04-02 04:40:32]  recommend  recommend this post  (131 visits) info

 CL,US,BO,CO,CR,PA,,PE,PR
img
Map of South Americansubduction zone and significanearthquakes. FromSusan Bilek reference listedbelow at **.A powerful earthquake off shore of Chile has generated a tsunami that has already produced six-to-seven-foot waves that have struck the beaches. The earthquake was centered about 60 miles northwest of Iquique and at a depth of about 12-13 miles. A tsunami warning has been issued for Colombia, Panama and Costa Rica, and geoscientists are working to determine the magnitude of tsunami waves [...]

No Earthquake Deaths in Alaska Since 1964 

Geology.com News [2014-02-23 13:15:42]  recommend  recommend this post  (80 visits) info

 US
The last deadly earthquake in Alaska occurred in 1964. It killed 131 people in Alaska and 16 more by tsunamis in Oregon and California. In the last 50 years there have been no earthquake deaths in Alaska even though several large earthquakes have occurred. Has that been

New Madrid is not Slowing Down 

Geology.com News [2014-01-30 13:23:39]  recommend  recommend this post  (57 visits) info

 US
“Earthquake activity in the New Madrid Seismic Zone in the central United States does not seem to be slowing down. USGS investigates whether current quakes in the region could be aftershocks of large earthquakes that occurred 200 years earlier.” Quoted from the USGS press

Japanese Volcano Asosan Has Small Eruption [video] 

Volcano Science And News Blog [2014-01-16 18:45:00]  recommend  recommend this post  (87 visits) info

 Quaternary; JP,US,IS,KM,RU
The volcano known as Asosan, one of Japan's most active volcanoes, has had a small eruption amid a period of heightened unrest. Nestled in the center of a 14+ mile wide Pleistocene caldera, the resurgent stratovolcano has produced phreatic and magmatic eruptions periodically since its first historically recorded eruption in 553 A.D. On the 14th (after the GVP report), Volcanodiscovery.com reported a magmatic eruption, and posted the below video.The report from the Smithsonian GVP is as [...]

Paleoearthquakes identified in W Nepal – seismic hazard higher than expected? 

Paleoseismicity [2013-12-08 16:34:38]  recommend  recommend this post  (220 visits) info

 NP
An interesting paper has been published in Nature Geoscience by Murphy et al.: Limit of strain partitioning in the Himalaya marked by large earthquakes in western Nepal. It doesn’t happen too often that paleoseismological papers are published in this journal … Continue reading

Monitoring Slow Earthquakes to Predict Large Earthquakes? 

Geology.com News [2013-09-16 13:41:23]  recommend  recommend this post  (64 visits) info
“We currently don’t have any way to remotely monitor when land faults are about to move” [...] “This has the potential to change the game for earthquake monitoring and prediction, because if it is right and you can make the right predictions, it could be

Our new paper on Chilean earthquakes 

Quake Hunters [2013-06-23 12:09:00]  recommend  recommend this post  (116 visits) info

 Quaternary
img
Our first paper on Chilean earthquakes is now available online in the journal Quaternary Science Reviews. The paper is open access, so the full text is free for anyone to read.The work we present sets out how we can use diatoms, microscopic algae, to quantify the changes in land level which occur during plate boundary earthquakes. We're interested in reconstructing these land level changes as they may provide a way of working out how big past earthquakes have been. Others have used similar [...]

In large earthquakes, the Earth moves for almost everyone 

Highly Allochthonous [2013-05-18 03:48:05]  recommend  recommend this post  (92 visits) info
The Global Positioning System has completely revolutionised how geologists study the deformation of the Earth. If you leave a GPS receiver in a fixed location for days, months and years, it is precise enough to measure motions on the millimetre … Continue reading
Stratigraphy.net | Impressum
Ads: