Hi Petra,

You mention you had these tones yesterday. However today there appears to be a cluster of some unusual quakes near Avenal...could this possibly be it? This cluster is in an area that does not see a lot of activity in that specific spott. So for you to say you had such unusual tones and the voila that cluster pops up leads me to wonder if that could be the area? Just a thought. This is in no way discrediting, or invalidating your research as to the locations that you see fit. Just throwing it out there.