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Video of Highway 101 Landslide in California
Looks like the Facebook video gets cropped when I embedded it here. You ca
San Francisco Millennium Tower Has Settled 16 Inches
Misrepresents actual foundation geometry. Photos show deep excavation to ne
New FHWA Soil Nail Manual Addresses LRFD, Hollow Bars
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Engineering Geologists vs Geological Engineers vs Geotechnic
Geological engineer from Spain (looking for job smiley geoengineer.martin@gmail
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Geologic Hazards
Newport's New Geologic Hazards Code Close to Adoption PDF Print E-mail
Written by Randy Post   
Tuesday, 05 July 2011 15:22

This is kind of interesting. The equivalent of the Oregon Geologic Survey, DOGAMI, has a geologic hazard map of the state that the City of Newport has used as the basis for a geologic hazard building code. This article describes some Recent and proposed changes to that code. Mainly the changes deal with the clarifications to the requirement for a geologic report, not requiring them on properties classified as moderate risk. But I found it interesting that the City Council approved a motion to only display the hazard maps in grayscale at City Meetings because the red color used on the DOGAMI map for high risk areas might scare people off from buying a property. [Source: oregoncoastdailynews]

Last Updated on Tuesday, 05 July 2011 22:41
 
New Route Chosen around Nile Valley Landslide in Washington PDF Print E-mail
Written by Randy Post   
Wednesday, 29 June 2011 15:20
Nile Valley Landslide, 2009

The new route for Washington State Route 410 will go around the toe of the Nile Valley landslide. The 2009 Nile Valley landslide blocked the highway and diverted the Naches River. The DOT selected the route out of 3 possible options. The other two options were to remove the slide and keep the same alignment, or to make permanent the temporary detour that goes through a normally quiet rural neighborhood. [Source: KIMA CBS 29. Image: WSDOT]

 
New fault discovery in California could burst dam PDF Print E-mail
Written by Randy Post   
Sunday, 26 June 2011 15:47
Martis Creek Dam near Truckee, CA. The dam is at risk from the newly discovered Polaris Fault.

The Martis Creek Dam is just outside of the town of Truckee California with a population of 16,000 people, but it is also upstream about 35 miles from Reno, Nevada the gambling town with a population of around 220,000. A newly discovered fault that crosses under the dam could potentially produce a 6.9 magnitude earthquake and potentially cause a failure of the structure. The fault was discovered from aerial LIDAR imagery analysis and confirmed and dated with paleoseismic trenching work done along various glacial terraces. [Source: Mail Online via AGC SmartBrief. Image: USACE via Mail Online]

 
Golder Geotechnical Investigations Precede Haiti Repairs and Retrofit PDF Print E-mail
Written by Randy Post   
Sunday, 19 June 2011 15:46
Haitians wait outside the Canadian embassy in the days after the earthquake, hoping to emigrate

Golder performed a comprehensive field investigation and seismic site classification at the site of the Canadian Embassy in Port-au-Prince, Haiti. Even though the embassy was relatively new, it was damaged during the 2010 Haitian earthquake. Vertical seismic profiling (VSP), borehole geophysics and other geotechnical investigations were performed at three sites owned by the Canadian government. No drill rigs were available in Haiti, so a rig was flown down from Canada on a commercial cargo plane. Transport in Haiti was a challenge as well since most of the equipment in Haiti is being used for the reconstruction. Once the data was collected, site specific ground shaking estimates were produced for use in the retrofit of the buildings. [Editor] Disclosure: Golder Associates, Inc. is the employer of Randy Post, the President of GeoPrac.net, LLC but they are not affiliated with the content of this site. [/Editor] [Source: Golder.com. Image: Haiti Today]

 
Iowa county evacuates as Missouri River tops levee and sand boil forms a geyser PDF Print E-mail
Written by Randy Post   
Monday, 13 June 2011 01:08

Residents of Iowa County were forced to evacuate as the swollen Missouri River caused a breach in one of its levees. What I found interesting was a description of a sand boil geyser:

A Black Hawk helicopter was dispatched to dump 1,000-pound sandbags on the failing earthen berm near Hamburg in hopes of closing a "boil" in it. The one- to one-and-a-half inch (2.5-3.8 cm) hole is creating a small geyser of water to shoot onto the dry side of the levee because of the water pressure, said Derek Hill, head of Iowa Homeland Security and Emergency Management.
[Source: Reuters via ASCE SmartBrief]

 
Indonesian Mud Volcano Marks 5 Years PDF Print E-mail
Written by Randy Post   
Thursday, 09 June 2011 15:46
Indonesian mud volcano after just 2 years of continuous eruption. Some scientists say it could continue for the next 25 to even 80 years.

The truly unique Sidoarjo mud volcano in Indonesia has erupted continuously for 5 years now. More than 40,000 people have been displaced and 12 villages destroyed. The rate of erruption has 'slowed' to 10,000 cubic meters per day and is being contained by dikes.

A geologist with Durham University in Britain, Richard Davies, said in Surabaya the volcano’s pressure is diminishing. But there a possibility the pressure could slowly build and cause an even bigger eruption. He says the mud volcano is the most unpredictable in the world. “The way it's behaved is entirely unnatural, and it is in fact completely unique. It has erupted continuously, pretty much, for five years. That is unheard of in natural mud volcano systems," he said.
[Source: voanews.com via Ontario Geo-Fish. Image: Reuters via Boston.com]

 
The Springhill Landslide in Utah PDF Print E-mail
Written by Randy Post   
Thursday, 09 June 2011 15:45
Springhill landslide movement rates for 2010-2011

This is a nice overview of a slow-moving landslide in a Salt Lake City, Utah neighborhood where you can go on Google Earth and do your own aerial photo analysis using Google's historic aerial imagery. Dr. Dave also points to some available resources from the Utah Geologic Survey that show the rate of movement accelerating with around 2-ft of movement over the past 6-months or so. [Source: The Landslide Blog. Image: Utah GS via Landslide Blog]

 
California Geologic Survey publishes deep-seated landslide susceptibility map PDF Print E-mail
Written by Randy Post   
Monday, 23 May 2011 00:03
cal_landslide_susceptibility

The California Geologic Survey has published a new map of landslide susceptibility for the entire state of California. It addresses only deep-seated landslides, not shallow slides such as debris flows. The criteria used for developing the map included slope angle, geology, rock shear strength and history of landslides in a given area. You can download the map for free from the California Geologic Survey.

Last Updated on Friday, 20 May 2011 22:03
 
Video: Geotechnical investigation of the March 11, 2011 Tohoku Earthquake, Japan PDF Print E-mail
Written by Randy Post   
Thursday, 28 April 2011 23:59

5619603229_55577ce7caThe NSF funded Geotechnical Extreme Events Reconnaissance (GEER) team has provided a preliminary report and some amazing photos and video of the damage to various regions of Japan affected by the moment magnitude 9.0 earthquake that struck on March 11, 2011.  Read on to see some amazing photos and video of the liquefaction damage related to the Tohoku Earthquake in Japan. (Photos from Oregon State Flickr)

Last Updated on Friday, 29 April 2011 00:36
 
Video: UC Davis team studies liquefaction in Japan PDF Print E-mail
Written by Randy Post   
Thursday, 21 April 2011 00:04

 

"I'm a member of an organization, the Geotechnical Extreme Events Reconnaissance Organization," said U.C. Davis Professor Ross Boulanger, Ph.D. Boulanger recently led a team of researchers in Japan, looking at how the dramatic earthquake compromised the ground in neighborhoods around Tokyo.

 

 

 
Taiwan Freeway No. 3 landslide probe finds likely causes PDF Print E-mail
Written by Randy Post   
Wednesday, 13 April 2011 16:18
Taiwan Freeway Number 3 Landslide in April of 2010

A panel of experts in civil engineering and geotechnical engineering has completed their investigation into the failure of the slope above Freeway No. 3 in Taiwan last April that killed 4 people. Their forensic geotechnical investigations concluded that the dip slope was already marginally stable. But they noted that they found corroded steel ground anchors that were part of the retaining system meant to restrain the slope. They conjecture that even though the contractor followed the relevant standards at the time of constructions, somehow voids formed around the cable during the grouting process and made the cable susceptible to corrosion.

Also noteworthy is that as a result of this failure, Taiwan's National Freeway Bureau has changed standards for grouting ground anchors. They also conducted a comprehensive survey of all slopes along freeways and identified 32 slopes that were placed on a priority list for monitoring and inspection and 17 were found to need some form of mitigation. [Source: Taipei Times. Image: Sulekha.com]

 
Regulators aware for years of understated seismic risks to nuclear plants PDF Print E-mail
Written by Randy Post   
Wednesday, 30 March 2011 05:22
Nuclear Reactors in the US overlaid on USGS Probability of Strong Shaking Map

With the events in Japan on everyone's mind, it's of course to be expected that seismic safety at nuclear power plants in the U.S. becomes a hot topic. This article discusses how the Nuclear Regulatory Comission has an on-going study to assess the seismic hazard of existing and proposed nuclear power plants in the eastern 2/3 of the country, where the risk is greater than was originally thought.

Nearly six years before an earthquake ravaged Japan’s Fukushima Daiichi nuclear power plant, U.S. regulators came to a sobering realization: seismic risks to nuclear plants in the eastern two-thirds of the country were greater than had been suspected, and engineers might have to rethink reactor designs.
[Source: The Center for Public Integrity via Ontario-geofish. Image: The Center for Public Integrity]

 
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