Notice the upswing at KLUD is so much stronger than what is seen now at ERZ1 & 2. Suspect that is due to so much fissure being open uprift of those two stations.
Time to make my YouTube video for people too busy to read this blog.
Disclaimers: The six hour data averages are snapshots. This means that peak highs and lows may actually be lower and not as in phase as this graph represents. To capture a moving average more closely, I would have to stitch the data together and then measure the average on shorter intervals.
Of course the natural followup question is what does this mean?
The four locations of these seismographs in a graphic.
The author of this blog hopes to spark interest in to get other people to contribute to actively looking and analyzing the data available.
Click the main title of this blog to see the rest of the blog.
It should be noted that the average over 6 hours does not show what may be the vital information that so many people are looking for. Specifically, many ask whether lava is about to erupt from the ground near their home. Looking at the last 6 hour average in the graphic above for ERZ2 things look kind of good. However, have a look at the actual seismograph itself.
Of course the large earthquake at around 11:34 am HST on May 26, 2018 is very prominent. However, there have been other quakes too. Instead, the obvious thing to me is the regular pulses seen before the quake occurred. Zoom in on the line for 10:00 am. You can see the same pulses with a smaller amplitude. These pulses stayed at roughly the same rate and grew in size until that large quake at 11:34 am.
Any seismologists out there care to comment?
What could be causing these pulses, and more specifically, is it evidence that there may be lava intrusion into the area.
Ah.. interesting.. but tell me, what frequencies are the seismometers set too? Are they the same? The reason I ask is because I know of many networks where the operator will use an array to record a larger range of frequencies. Did you adhere to any particular protocol when you set the equipment in the field?
ReplyDeleteThe seismographs are installed and maintained by HVO. The files I am working from are image files that do not contain any data about the instrument setup. One concern already expressed is that the instruments are set at a different gain. This means one instrument might be more sensitive to changes than another. This could account for differences seen between ERZ1 and ERZ2. ERZ1 seems to reflect earthquakes better. However, on the other hand the total seismic activity of ERZ2 is higher currently than ERZ1. I am sure the HVO would have adhered to protocols. However, I am already aware there is one significant difference among the four instruments. Data for PHOD and KLUD are both being stored in a large central data base, however, ERZ1 & 2 do not seem to be in that data base. I was able to download KLUD data files for all of may. 322 megabyte file size. However, because my computer is a Windows 10 and not older Windows 7 I have not been able to open the file. I currently do not have my UNIX computer which I once used to employ to look at 100's of thousands of data files.
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