A very well-respected specialty geotechnical contractor. They have a number of nice technical articles and case studies published on their website.
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ESRI
ESRI designs and develops the world’s leading geographic information system (GIS) technology. GIS is an important tool—one that helps shape the world around us. Visit ESRI
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Geotechnical Earthquake Engineering Portal
The Geotechnical Earthquake Engineering Portal intends to provide useful resources on geotechnical earthquake engineering. Visit Geotechnical Earthquake Engineering Portal
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Arizona Geology
Blog of Lee Allison, Arizona State Geologist. Visit Arizona Geology