Looking back from one extreme to another

With this heat wave, it helps to look back at cooler time.  This was taken during a refraction survey to support a seismic site classification from Vp / Vs.  Single digits and windy.  At least when its cold you can layer up and get warm.  Doesn't work in reverse when it is hot; there are practical limits to layering down.

Injection induced seismicty

Very interesting collection of papers in The Leading Edge regarding injection-induced seismicity.  Fluid injection during petroleum production can cause crustal movement with significant seismic energy. 

"Preliminary hazard models indicate that areas experiencing the highest rate of earthquakes in 2014 have a short-term (one-year) hazard comparable to or higher than the hazard in the source region of tectonic earthquakes in the New Madrid and Charleston seismic zones."

Read More: http://library.seg.org/doi/abs/10.1190/tle34060618.1

Big Walnut Sanitary Trunk Extension - Phase 2

Xenon is excited to work with iTunnel and the rest of the Stantec team on the BWSTE tunnel in Columbus, Ohio.  We will be providing geophysical services to characterize the subsurface conditions along alternate tunnel alignments.  Great work with a great team.