A cool new study indicates there may be potential for seismologists to gather information on the ocean subsurface using passive seismic data collection with whale songs as the seismic source! Researchers from Oregon State University determined that underwater geophones on the surface of the ocean can detect seismic signals originating from the songs of fin whales. When they can correlate the songs from three different geophones, they can triangulate the position of the whale and use that information and the seismic data much in the same ways as traditional seismic surveys. There is more information on the new whale song paper at Forbes.com (may require subscription).
Geosynthetica has some interesting photos of so called ‘whales’ in geomembranes. These giant bubbles are caused by a variety of things, but are essentially gas trapped underneath the geomembrane that can have significant buoyant force, […]
As a follow up to a previous post, the San Andreas Fault Observatory at Depth (SAFOD) team has announced that they have successfully completed their drilling and obtained cores of the San Andreas Fault at depths in excess of 2 miles below the surface. The zone of interest is approximately 135-ft in length. The core size is 4-in diameter. They have cemented in a 7-in casing and the next phase of the project will be to perforate the casing within the fault and install monitoring equipment consisting of seismometers, accelerometers, tiltmeters and a fluid pressure transducer. Read on for more info and links. (Image credit: EarthScope / NSF)