Re: 6.1 Quake Offshore Philippines
Posted by
Jackstraw on 1/30/2010, 3:11 am
And they also have to throw this in the mix when saying it is fault slippage and not shallow magma.....
"At this time, no one has noted any anomalous changes in surface discharges (hot springs, gas output, etc.). Keep in mind that it is winter and much of the park is covered in snow."
You are correct that "harmonic" tremors can be a sign of magma movement. But they also can reflect the natural resonance of a heavily fractured fault area. Science has gotten pretty good at detecting magma moving. The fly in the ointment is small scale slip faults that are hard to detect and that can weaken the cap on the magma chamber (why quake swarms are carefully looked at). Most geologists agree if Yellowstone is going to blow there will be obvious warning signs in seismic signature. But will it matter how forewarned we are? |
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