hvsr case studies galore to help curb your scepticism 4 ... · hvsr case studies galore to help...

HVSR case studies galore to help curb your scepticism

4 mineral case studies

Jayson Meyers Principal Consultant

Selected Australian and New Zealand case studies showing HVSR survey results from Tromino 3G ENGY instruments; ones that I have permission to show…

Tromino results compared with other geophysical survey results

Depth to hard bedrock estimation is very robust under the right geological conditions of strong acoustic basement impedance contrast below regolith and sedimentary deposits

Generally 2 instruments leapfrogging along a survey line for greater production, wide spaced for rapid reconnaissance or close spaced for detail

Field operation is very simple, use fieldies

HeliTEM dB/dt Z Ch20

Permian Rookwood Volcanics

Permian Rookwood Volcanics

HeliTEM CDI block model

Tromino results follow drilling very well, seems to work!

200m spacing

10 min

20 min

112 min

15 min optimal Wind noise

Bedrock from drilling

50 MHz GPR limited to 20m

50m spacing

Predicts and maps bedrock depth to within 10m

Nabberu Basin

Yilgarn Craton

BIF 250-1,000m spacing

BIF

VTEM dB/dt Z ch30

BIF

Photo

100m spacing Under sampled?

100m spacing