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Geometrics Inc are holding a short course on Ambient Noise Tomography Using the Geometrics Atom Passive Seismic System and SeisImager/SW Data Analysis Software on the 15th of March 2019, the Friday before SAGEEP, at Geometrics head quarters in San Jose.

A new passive surface wave method has been developed that delineates 2D or 3D near-surface S-wave velocity (Vs) structure from ambient noise obtained from dozens of receivers on the ground surface. The new Atom cableless (nodal) seismic system is used for data acquisition. The Atom’s GPS-controlled timing permits individual acquisition units to be synchronized over any distance without cables. Ambient noise is recorded and the data processed using a common midpoint Spatial Autocorrelation method called CMP-SPAC.

Coherencies are first calculated for all pairs of receivers, then coherencies having common midpoints (CMPs) are grouped together and a dispersion curve is calculated at each CMP.

A one-dimensional inversion with horizontal constraints is used to estimate a 2D or 3D Vs model.
The short course will include discussion of passive surface wave theory and methods using the Atom seismic system. Also to be provided are numerical and field examples to demonstrate how this method can be used to quickly estimate 2D and 3D Vs structures over a range of depths, up to 100+ meters.

Instructor Dr. Koichi Hayashi, OYO Corporation/Geometrics, Inc.
Date March 15, 2019 (the Friday before SAGEEP Portland), 9am to 4pm
Location Geometrics, Inc., 2190 Fortune Drive, San Jose, CA 95131, (408) 954-0522 [4 miles from Norman Y. Mineta San Jose International Airport (SJC)]
Cost $300 (by Visa or AMEX); reduced pricing available for students. Only 10 discounted student places available!
Bring Windows laptop
Registration By March 1, 2019 to registration@geometrics.com
Questions Please contact Deborah Underwood at deb@geometrics.com

As another year draws to a close we would like to wish all of our customers and suppliers a very Merry Christmas and a healthy and prosperous New Year. As is our tradition we will be making a charitable donation to The Willen Hospice in Milton Keynes, in lieu of sending out Christmas cards

Geomatrix Earth Science are proud sponsors of the Geophysical Society at Imperial University who organise an annual instrument field demonstration for new undergraduate students in Hyde Park.

SAMM is a Stand Alone Mosaicking Module designed to run alongside existing manufacturers data acquisition programs to enhance survey capability by proving real-time mosaicking, georeferenced charts, satellite imagery overlays and geo-coded observation classification for Forward Look Sonar, Side Scan Sonar and Multi Beam systems.

The most recent version of the software includes a bottom track function (for selected Side Scan Sonar systems) and pseudo ‘Single Beam’ bathymetry if the side scan is hull/poll mounted.

With a simple easy to use interface SAMM is ideal software choice for underwater search and survey.

In recent months Seismic-Mechatronics have been working on increases the output force of their Lightning electromagnetic seismic vibrating source through synchronising multiple units to within 8us.

The P & S wave source is the most powerful vibrating source for it size available commercially, and can be run from a 48VDC or mains supply. The Lighting is proving itself to be a power yet easy to use seismic vibrator source for near surface site investigation and structural dynamics testing.

Further information can be found on the Lightning webpage or feel free to email sales@geomatrix.co.uk.