Depth section by HRRS - fall line profile. CLICK FOR ENLARGEMENT

An example of carst cave hall localisation in Slovakian Karst

Measurement by the method of high resolution reflection seismics (HRRS) - localisation of a cave hall in the steep slope of the karst plateau edge

In this locality we found a cave hall in the depth of 20 m. It's approximate location was known before our measurement. It was discovered by cave divers and they wanted to make the cave part behind syphon trap accessible by tunnel. We used HRRS method with the higher frequency seismic energy source (120 Hz - 1kHz). Lower frequencies was cleared out in FD with help of a suitable transfer function.
In the depth section on the right (fall line profile) you can recognize the cave (approximate dimensions 10 m * 5 m * 5 m) by the reflection polarity symptom - marked by yellow points.
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Depth section of the cross profile with well-marked tectonic line:

Depth section by HRRS - cross profile. CLICK FOR ENLARGEMENT.

The main tectonic fault (predisposing the developement of our cave hall) is marked by red wide line in the section. Inverse reflection areas (i.e. areas of lower wave resistance with probable presence of carst cavities) are marked by yellow points.

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Measurement by the method of high resolution reflection seismics (HRRS) - fall line profile HRRS measurement - cross profile

A depth section by HRRS and SRS - cave deposit thickness determination. CLICK FOR ENLARGEMENT

An example of cave deposit thickness determination and localisation of cavities under measurement profile leading by centerline of the spacious cave hall

měření HRRS v jeskyni v Moravském krasu

The determined thickness of the cave bottom deposits (by the method of SRS) was from 8 to 14 m. On the same profile we used also the method of high resolution reflection seismics (HRRS) with the step of reflection point 0.5 m and shot step from 2 m to 4 m.
On the depth section on the left we can see interesting reflection from the depth approximately 30 m. It could be caused by carst cavity...
(Simplified)