Not everything we hear is a noise mediated by the ear.
We hear many sounds which are directly interpreted as sounds by the nervous
system of the brain without the use of the ear.
To understand this, remember that the ear picks up vibrations which then moves
small hairs at the end of which a nerve creates a chemical or physical impulse
into a nerve axon which then is sent down the fiber to a portion of the brain where
it is interpreted as noise.
It is quite easy to bypass this process. The right combination of electromagnetic
signals, for example can induce a current in the nerve, just as they would in a
wire. That signal can then be interpreted as "sound" by the brain even though
no vibrations occur. Have you ever stood under a high voltage wire and heard
a "humm". There is no physical vibration there. Your brain is interpreting the
electromagnetic field as a sound. To prove this to yourself, next time you are
in this situation try to locate the origin of the sound. Most people find they think
the sound is originating at a point about 4-6 inches above the middle of their head.
Another example is the problem of tinitis. People "hear" a sometimes very loud
noise in their ears continuously. This is caused by nerve damage. There is no
actual noise in the physical sense.
For some people whose nerves have faulty connections when they hear they
actually "see" geometric shapes. Does this mean the shapes exist physically -
hardly, but that is how their brain interprets sound.
I do not claim to be a sensitive, but do have ear tones from time to time. For me,
these are consistently related to sudden changes which can be later documented
in the geomagnetic environment. It is only a short step to see how such changes
can induce currents in nerves just as they do in wires and ore bodies in the earth
which might be interpreted as "sound".
Since earthquakes are commonly associated with geomagnetic storms, and
possibly related to induced currents caused at the time of solar flares and geomagnetic
storms, it may be reasonable to speculate that the "hearing" of an ear tone is a true
precursor to earthquakes (if this is the cause) as it alerts us to the possibility
of induced currents.
I do not hear your tones, and cannot interpret them. That is for you to do. I can only
hear my own and find what are satisfactory answers for myself. Your answers may
be totally different, but equally as correct as mine.