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   Strategies & Market TrendsTaking Advantage of a Sharply Changing Environment


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To: Doug R who wrote (5089)9/24/2021 10:21:25 PM
From: Doug R
   of 5215
 

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To: Doug R who wrote (5085)9/25/2021 8:35:25 AM
From: Litore Lapis
1 Recommendation   of 5215
 
Translated from the web site.

"A new indicator of volcano activity, the RSAM, has been published, which is the amplitude of the tremor measured at a seismic station near the eruption. Tremor is directly related to the explosiveness of the volcano and the amount of magma that comes out. Check in the La Palmasection."

IGN-LA PALMA-SIS



Real-time Seismic Amplitude Measurement (RSAM): a volcano monitoring and prediction tool

Real-time Seismic Amplitude Measurement (RSAM): a volcano monitoring and prediction tool | SpringerLink

"Seismicity is one of the most commonly monitored phenomena used to determine the state of a volcano and for the prediction of volcanic eruptions. Although several real-time earthquake-detection and data acquisition systems exist, few continuously measure seismic amplitude in circumstances where individual events are difficult to recognize or where volcanic tremor is prevalent. Analog seismic records provide a quick visual overview of activity; however, continuous rapid quantitative analysis to define the intensity of seismic activity for the purpose of predicing volcanic eruptions is not always possible because of clipping that results from the limited dynamic range of analog recorders. At the Cascades Volcano Observatory, an inexpensive 8-bit analog-to-digital system controlled by a laptop computer is used to provide 1-min average-amplitude information from eight telemetered seismic stations. The absolute voltage level for each station is digitized, averaged, and appended in near real-time to a data file on a multiuser computer system. Raw realtime seismic amplitude measurement (RSAM) data or transformed RSAM data are then plotted on a common time base with other available volcano-monitoring information such as tilt. Changes in earthquake activity associated with dome-building episodes, weather, and instrumental difficulties are recognized as distinct patterns in the RSAM data set. RSAM data for domebuilding episodes gradually develop into exponential increases that terminate just before the time of magma extrusion. Mount St. Helens crater earthquakes show up as isolated spikes on amplitude plots for crater seismic stations but seldom for more distant stations. Weather-related noise shows up as low-level, long-term disturbances on all seismic stations, regardless of distance from the volcano. Implemented in mid-1985, the RSAM system has proved valuable in providing up-to-date information on seismic activity for three Mount St. Helens eruptive episodes from 1985 to 1986 (May 1985, May 1986, and October 1986). Tiltmeter data, the only other telemetered geophysical information that was available for the three dome-building episodes, is compared to RSAM data to show that the increase in RSAM data was related to the transport of magma to the surface. Thus, if tiltmeter data is not available, RSAM data can be used to predict future magmatic eruptions at Mount St. Helens. We also recognize the limitations of RSAm data. Two examples of RSAM data associated with phreatic or shallow phreatomagmatic explosions were not preceded by the same increases in RSAM data or changes in tilt associated with the three dome-building eruptions."

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To: Doug R who wrote (5085)9/25/2021 12:47:06 PM
From: worldcup1998
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Yes, that shockwave looks very similar to the Beirut blast


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To: Litore Lapis who wrote (5091)9/25/2021 4:23:35 PM
From: Litore Lapis
1 Recommendation   of 5215
 
Some useful recent facts on the La Palma volcano here.


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To: Litore Lapis who wrote (5091)9/27/2021 4:57:02 AM
From: Litore Lapis
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That graph self updates. The volcanic activity on La Palma looks to have ceased for now.

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To: Litore Lapis who wrote (5094)9/27/2021 9:47:13 AM
From: Doug R
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Either that or something "broke" on the measurement end.
Doesn't make sense:

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To: Doug R who wrote (5095)9/27/2021 12:44:53 PM
From: Litore Lapis
   of 5215
 
The volcano is visibly inactive now apart from some wisps of smoke.

Looks to be a good indicator.


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To: Litore Lapis who wrote (5096)9/27/2021 12:48:05 PM
From: Doug R
   of 5215
 
Phew.

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To: Doug R who wrote (5097)9/27/2021 1:29:16 PM
From: Litore Lapis
   of 5215
 
At home, I am helping out with some building work. It's near sea level so mega tsunamis would be inconvenient right now.

So I'm hoping that might be it.... never can tell with volcanos though.

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To: Litore Lapis who wrote (5098)9/27/2021 1:44:19 PM
From: Doug R
   of 5215
 
Yeah, woulda been a trifle disruptive for you.

The asteroids have come and gone.
The asteroid/earthquake guy may or may not be right.
His method would have to be checked but he's too difficult to work with in a way for that to be done properly.

It's also a pain in the ass trying to wait for him to say anything about which asteroids he's "calculating" (his term) to do what/where. About 95% or more of the EQs he says he has calculated (maybe 3 days ago in some random spot in a previous stream) are very small. 2s and 3s. Too insignificant to rule out that he's taking random potshots and hitting now and then.
He just streams all day on and off randomly while displaying graphics from his asteroid tracking and EQ tracking apps...and just generally talking to a group of diehard "followers".

All while living in a car.
All on his phone.
It's all very weird.
He seems satisfied with the way things are for him.
Supported by donations on the chat I suppose.


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