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Video of Highway 101 Landslide in California
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San Francisco Millennium Tower Has Settled 16 Inches
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Geologic Hazards
Video: Massive Earthworks to Stabilize US 89 Landslide PDF Print E-mail
Written by Randy Post   
Friday, 21 November 2014 00:40

By April of 2015, the contractor for Arizona DOT's US 89 Landslide Stabilization project will have move over 1 million cubic yards of material to build a massive stabilizing berm. They are using CAT 773 haul trucks to move material, equipment more commonly seen in mining applications. Check out the video!

[Source: ADOT YouTube Channel. Image: YouTube]

Last Updated on Friday, 21 November 2014 07:53
 
Alaskan megathrust fault more active under Kodiak PDF Print E-mail
Written by Randy Post   
Wednesday, 22 October 2014 23:27
Damage on Fourth Avenue in Anchorage Alaska after the Good Friday Earthquake of 1964

The 1964 Alaska Earthquake was 9.2 in magnitude and caused dramatic destruction and dramatic examples of surface rupture, subsidence, and liquefaction. New paleoseismic evidence points to a previously unknown earthquake that happened on the same fault segment approximately 500 years ago. This new evidence would change the recurrence interval for the earthquakes on the Alaskan megathrust fault, which would affect seismic hazard in Alaska, but could also increase the tsunami hazard in places as far away as California and Hawaii. [Source: EARTH Magazine via AEG Insider. Image: Wikipedia]

 
Underwater landslide may have doubled 2011 Japanese tsunami PDF Print E-mail
Written by Randy Post   
Monday, 29 September 2014 23:27
A tsunami flowing into the city of Mikayo after the 9.0 magnitude Fukushima earthquake March 11, 2011 (JIJI PRESS/AFP/GETTY IMAGES)

A seismologist at the University of Tokyo believes that the monstrous tsunami that was responsible for so much damage and loss of life during the 2011 Fukushima earthquake may have been a result of a submarine landslide the size of Paris. The researchers reached their conclusion by back-analyzing the wave motion measurements from buoys on the day of the earthquake. After modeling the size and approximate location of the landslide, other team members were able to compare bathymetry data from before and after the earthquake to locate the slide. [Source: Read more at Science/AAAS. Image: The Science Show]

 
Video: Construction Begins on Buttress for US 89 Landslide PDF Print E-mail
Written by Randy Post   
Wednesday, 10 September 2014 23:31

The Arizona DOT and their contractor have begun blasting and earthwork to realign a portion of US 89 in northern Arizona near Page that was cut off by a large landslide in February of 2013. The massive blasting and excavation operation to push back the slope above the road will generate around 1 million cubic yards of material which will be used to construct a massive buttress at the toe of the slide. Check out the video below. [Source: ADOT YouTube Channel. Image: YouTube]

 
Magnitude 6.0 Earthquake in Napa, California PDF Print E-mail
Written by Randy Post   
Sunday, 24 August 2014 23:12
A magnitude 6.0 earthquake struck near Napa, California on August 24, 2014.

Early Sunday morning, a 6.0 Magnitude earthquake struck near Napa California lasting 10 to 20 seconds, sending 120 people to the hospital and damaging buildings, breaking water mains, disrupting power distribution, and breaking gas lines and causing fires. The earthquake was the largest to strike the Bay Area since the 1989 Loma Prieta Earthquake. I will provide more info relevant to geoengineers in the coming days. If you find any interesting info, leave a comment, or email or tweet it to me (@geoprac). [Source: Read more at the LA Times. Image: Rick Loomis / Los Angeles Times]

 
Oso landslide: differences of opinion about the landslide mechanisms PDF Print E-mail
Written by Randy Post   
Thursday, 31 July 2014 00:32
Two-fold failure event evident in the seismic data

Professor Petley, the author of the Landslide Blog, has an interesting discussion about a controversy in the geoengineering / geology community regarding the Oso landslide in Washington State. The Geotechnical Engineering Extreme Events Reconaissance (or GEER) report was recently issued for the OSO landslide. But USGS scientists have a different theory about the event. Both the GEER committee and the USGS agree that the Oso landslide was a two-fold failure event. But the difference in interpretation is the relative sizes of the two events and the mechanism they took. I won't try and explain the controversy here as the post at the Landslide Blog does a great job of that. [Source: The Landslide Blog. Image: Landslide Blog]

 
Crazy Rock Slide in China (Video) PDF Print E-mail
Written by Randy Post   
Thursday, 31 July 2014 00:16

According to the Landslide Blog, this rockfall video was taken in Maoxian County in Sichuan Province of China on or around July 17, 2014. It shows a very dangerous rockfall event with people running from their cars. In one scene you can even see someone being struck by a rock and knocked over. The person is later able to walk away with assistance. Towards the end of the video, even the windshield of the videographer is struck by a smaller rock and cracked. Very dramatic and very scary video!

Crazy Rockfall Video from China

[Source: YouTube via Landslide Blog. Image: YouTube]

 

Last Updated on Thursday, 31 July 2014 07:19
 
World Cup 2014: a landslide affects the city of Natal in Brazil PDF Print E-mail
Written by Randy Post   
Tuesday, 01 July 2014 00:27
Brazil soccer/football fan surveys the landslide damage in Natal

Torrential rain in the World Cup city of Natal caused a landslide right around the time that the USA defeated Ghana. According to the Landslide Blog, the landslide destroyed 50 homes but there were no lives lost. A You-Tube Video showing the landslide as seen from a small UAV shows the devestation, and interestingly shows a storm drain that could have played a role in the failure, perhaps becoming overwhelmed after the 50 hours of rain that fell on Natal. [Source: The Landslide Blog. Image: NBC News]

 
Massive Mudslide In Western Colorado, 3 Missing PDF Print E-mail
Written by Randy Post   
Wednesday, 28 May 2014 00:17
Aerial view of the Mesa County Colorado Mudslide

A massive mudslide approximately 1 mile by 3 miles by 250 feet deep has occured in Western Colorado over the Memorial Day weekend. There are reports that 3 men from the nearby Collbran/Mesa area are missing. According to the Forbes article, the estimates of the size would make it three times the size of the catastrophic Oso landslide in Washington. [Source: Forbes via @CanGeotechJournal. Image: Forbes / Twitter / Denver Post - Photographer AAron Ontiveroz]

 
Magnitude 9.2: The 1964 Great Alaska Earthquake PDF Print E-mail
Written by Randy Post   
Sunday, 18 May 2014 23:37

It's been 50 years since the Magnitude 9.2 Great Alaskan Earthquake so dramatically altered people's perceptions of the power of earthquakes. Check out this short video from the USGS:

[Source: YouTube via AEG Insider. Image: YouTube]

Last Updated on Monday, 19 May 2014 06:40
 
Oso Landslide Update PDF Print E-mail
Written by Randy Post   
Thursday, 03 April 2014 06:36

Oso Landslide (Wikimedia)The Oso Landslide death toll is now up to 29. This is one of the worst natural hazard disasters I can remember in recent times. First and foremost I think should be the memories of the victims. There are so many heart-wrenching stories of the people that lost their lives in this giant landslide. I think those stories underscore the importance of the jobs of geologists and engineers.

We have a responsibility to protect life and property in the work that we do. I'm not saying this landslide or the loss of life could have necessarily been prevented, but I personally take tragic events like this as a reminder of the sacred charge of our profession and use it as motivation in my daily practice of geological and geotechnical engineering. With regards to the geology and engineering aspects of the Oso Landslide, below are several links that I found interesting or informative.

Last Updated on Thursday, 03 April 2014 07:11
 
8.2 Magnitude Earthquake off Coast of Chile, Triggers Tsunami Warnings PDF Print E-mail
Written by Randy Post   
Tuesday, 01 April 2014 23:25
April 1, 2014 Chilean Earthquake Location

A magnitude 8.2 earthquake struck off the coast of Chile late Tuesday. The damage estimates will probably begin rolling in today, but early indications are that it could have been much worse. Some 5 people have been killed in the early figures. There have been reports of landslides and disruption of communication facilities. A tsunami warning was triggered, and there are warnings of high water levels and strong currents impacting Hawaii, but so far no reports of a major tsunami along the Chilean coast. [Source: CNN.com. Image: Ontario-geofish]

 
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