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Hi Subscribers,
From some years until now I have made sea bottom mag surveys using the proton mag MX500 - a proton mag with a torus shape coil.
As diver, I know must of the underwater anomalies and I build up a good feeling about mag signature correlated with the ferrous remains.
The MX500 can read two ways, simple mag readings (1, 2 or 3 seconds polarizing time) or pseudo gradiomiter performing time shift readings (1,2 or 3 seconds). This is the best option for igneous rocky (black sand) terrain.
The mags are good devices but, like here over granite continental shelf, supposedly do not existing black sand or igneous rocks (basalt) the anomalies must be correlated with some kind of magnetic material.
It hapens in some places, I have a high gama readings (half thousand gamas) both in simple mag and grad on a very well delemited area (100 meters long by 40 large). And nothing more than the granite rocky bottom all around (40 meters deep)!!!
It is impossible to exist some kind of ferrous material sunken, the bottom is completely rocky (granite - nom magnetic !) with some litle mudy sockets.
Any of you have such readings on the same evironmental conditions ?
On diferent kind of bottom plenty of old lost anchors and steel fishing garbage, acurate readings like one gama and below, is a dream and time consuming. So very sensitive magnetometers will sense all this mag field shifting and it will be a inutile search.
Greetings
From some years until now I have made sea bottom mag surveys using the proton mag MX500 - a proton mag with a torus shape coil.
As diver, I know must of the underwater anomalies and I build up a good feeling about mag signature correlated with the ferrous remains.
The MX500 can read two ways, simple mag readings (1, 2 or 3 seconds polarizing time) or pseudo gradiomiter performing time shift readings (1,2 or 3 seconds). This is the best option for igneous rocky (black sand) terrain.
The mags are good devices but, like here over granite continental shelf, supposedly do not existing black sand or igneous rocks (basalt) the anomalies must be correlated with some kind of magnetic material.
It hapens in some places, I have a high gama readings (half thousand gamas) both in simple mag and grad on a very well delemited area (100 meters long by 40 large). And nothing more than the granite rocky bottom all around (40 meters deep)!!!
It is impossible to exist some kind of ferrous material sunken, the bottom is completely rocky (granite - nom magnetic !) with some litle mudy sockets.
Any of you have such readings on the same evironmental conditions ?
On diferent kind of bottom plenty of old lost anchors and steel fishing garbage, acurate readings like one gama and below, is a dream and time consuming. So very sensitive magnetometers will sense all this mag field shifting and it will be a inutile search.
Greetings
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