I have completely renamed this thread in hopes some one will pay attention to me...in particular, astrocreep, kukla, and anybody else that has even a
smidgeon of knowledge in this area.
Please review the past week of webicorders in the Cascades...
Pay special attention to Mt. Baker, which is just absolutely gone freakazoid, and the Dome Station and South Ridge station on St. Helens.
If we look only at the past week (and I've been harping for a month now) we see the following three types of seismic indications:
1. HF earthquakes - high frequency earthquakes, regular old earthquakes caused by brittle fracture, fault slip, etc.
2. Spasmodic bursts or rapidfire bursts - basically high frequency earthquakes that overlap each other - I quote from USGS "rarely, if ever, occur
in purely tectonic regimes" and "consistent with hydraulic fracturing of previously unbroken rock".
3. LP and VLP earthquakes - long-period and very long-period earthquakes - caused by fluid-dynamic processes (i.e. magmatic encroachment - volcanic
4. Harmonic tremors - basically overlapping long-period earthquakes - I quote from USGS again: "HARMONIC TREMOR ACCOMPANIES NEARLY ALL VOLCANIC
ERUPTIONS AND COMMONLY PRECEDES THE ONSET OF ERUPTIVE ACTIVITY BY HOURS TO DAYS." You CAN have harmonic tremors WITHOUT an eruption...but you
typically don't have an eruption without harmonic tremors.
Okay, so we have ALL of the above happening.
HELLO! HELLO! Anybody out there? Can you hear me now?
P.S. AFTER A WEEK OF BIZARRE RECORDINGS ON MT. ST. HELENS' - THE SOUTH RIDGE WEBICORDER IS COMPLETELY OFFLINE AT THIS TIME.
[Edited on 24-1-2004 by Valhall]