seismicity map

can we determine a possible fault without going to site with the use of a 2-D map without going to site..if so then what are the possible assumptions..thanks

If you want to know if it's possible to identify faults without visiting a site or running seismics than the answer is yes. There are ways to use remote sensing to identify faults, but usually inaccuracy is high and confidence low. One can use aeromag (very useful) and gravity surveys. Sometimes satellite photography or just plain topography can hint a geologist in to where faults may be. Also submarine oilseeps are picked up by satellite imagery and can hint towards faults.

hope this makes it clear.

please see your other post for different remote sensing options... and further explanation.

Admin, can we merge these topics?

The topic has been merged and avargas' most complete question kept.

Thanks for notifying petrel_user.

mr petrel,

attached is the map with a determined active fault..my problem is the probable fault..thanks

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Avargas,

I believe the file you uploaded is a topographical map, so the contours indicate the height of the land. The blue lines, the rivers, follow the topographic lows. Fault zones often create weakness and allow for faster erosion. Faults or fault-zones therefore often result in rivers flowing through them. The large approximate fault (dotted red line) has two mayor rivers running through it.
Also the solid red line follows a river and has been checked and certainty is high that this is a fault. Because to the south (map is rotated 90 degrees) of this fault trace topography continues to show a sharp (straight) valley it is likely that the fault (or at least the zone of weakness) continues through there. This is the purple dotted line.

Is this for a geology class btw??

mr petrel,

thanks for the info...currently we will construct a proposed mini hydro as indicated in the map with a tunnel line..my problem right now is my assumptions on the support for the tunnel line if a probable or normal fault will pass through it...thanks

I personally find this ridge, indicated with the green line, a much more interesting feature. It looks like a topographic high that is a little too straight for not being associate with some kind of structure. This may be a resilient ridge (maybe a dike) or some sort of fault scarp... It is located much closer to your proposed tunnel.

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thanks mr. petrel

Mr petrel user..

I am looking for tutorials of seismic interpretation using petrel.if you could guide me on that then it will be very helpful.