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April 2013

Response to the Whidbey Island Landslide Event.
Stephen Slaughter at March 2013 Whidbey Island slide event
Hazards Geologist Stephen Slaughter examines debris and damage to a Whidbey Island home caused by the Ledgewood-Bonair Landslide event that occurred on March 27, 2013.

DGER geologists who responded to March 27th's landslide event, now known as the Ledgewood-Bonair Landslide, have since released an unofficial, unedited report detailing their on-site reconnaissance, as well as information pertaining to past observations made of that site. You'll find this most interesting read here!

 

The report references DGER mapping geologist Michael Polenz's 2009 Geologic Map of the Camano 7.5-minute quadrangle (excerpt seen below). The Camano map includes the affected area, which Polenz had identified as Quaternary landslide deposits and slide-prone terrain, including the "presence of unambiguous landslide features."

 

Excerpt from the 2009 Camano 7.5-minute quadrangle
Excerpt from the 2009 Camano 7.5-minute quadrangle. Click here to download full map (~10 MB).

LB slide  

 

April Geology Image of the Month

Thanks to our hazards geologists and landslide experts, Isabelle Sarikhan and Stephen Slaughter, we were able to bring you detailed pictures (including this month's photo) and information on this large Whidbey Island landslide event, now known as the Ledgewood-Bonair (LB) Landslide, immediately after its occurrence on March 27, 2013! As a result of their study, the hazards team released a Quick Report on March 28 detailing their initial on-site investigation of the LB Landslide. The report suggests that the LB event may be a reactivation of a portion of a larger, prehistoric (~11,000 years old) landslide complex, which extends approximately 1.5 miles along the Whidbey Island coastline. According to the report, "the dimensions of the [LB] landslide are approximately 1100 feet long (measured parallel to the shoreline) and about 300 feet into Puget Sound. Initial estimations place the volume of material mobilized as great as 200,000 cubic yards (~40,000 dump truck loads)."

To see more images of the LB Landslide click here to visit the DNR Flickr site.

 

 

We welcome public contributions for the Geology Image of the Month feature. The images have pride-of-place as our header image for our blog site, www.washingtonstategeology.wordpress.com, for the month, and are archived in the blog site's Image Gallery.

If you have a Washington geology image that (1) you have the rights to share, (2) can be cropped horizontally to fit our header space, and (3) for which you have a detailed description of the subject matter, contact us! We'd love to show off your great pics!

What's New on the Web?

 

Now Available: Google Earth .kmz files for 100K-scale surface geology of Washington by county.  

 

Ever wished you could view the surface geology information that we offer on our portal as a Google Earth overlay? Now you can! We have generated 39 .kmz files (one per county) that allow the user to visualize simplified versions of our 1:100,000 kilometer-scale surface geology maps in the Google Earth environment. Users can take advantage of functionality native to the Google Earth program, such as terrain generation (pseudo-3D visualization), overlays, and transparency, while using place markers and other Google Earth features to which they are accustomed. The overlays provide geologic information such as age of rock units, presence of major faults, and basic lithology, giving users the ability to observe Washington geology and how it interacts with land features.    

 

To download our Google Earth surface geology overlays and to get further information on how to use them, please visit our GIS data webpage and scroll down to "Google Earth 1:100,000 Scale Surface Geology 3D Overlays" at the bottom of the page. 

screen capture of King County surface geology kmz
Screen shot of King County .kmz file showing 100K-scale surface geology draped on the Google Earth viewer's pseudo-3D terrain.


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DGER Welcomes Daughters and Sons!

Mark your calendars!  

On April 25th the Washington Geology Library will join DNR in celebrating Take our Daughters and Sons to Work Day. The theme this year will be Forests: A Work in Progress.

The Geology Library will open its doors to parents and kids, with special events from 9-11 AM. According to librarian Stephanie Earls, "We'll have various rock samples to view, handouts about various geologic processes, and may also play some educational videos while the kids are here.  Then we will send the kids home with a few samples to add to or start their own rock collections."

Please contact Stephanie for more information at stephanie.earls@dnr.wa.gov, (360) 902-1473.

 

Washington State Department of Natural Resources | 360-902-1000 | bob.redling@dnr.wa.gov | http://www.dnr.wa.gov
1111 Washington St. SE
Olympia, WA 98501

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