To start, if you have not seen the original article about the event I am going to be talking about then please CLICK HERE. This post here will not make much sense unless you read the original.
On September 24, 2018 a very strange event occurred at Mt. Hood. It originally was listed as an earthquake. The earthquake in question was analyzed and its characteristics indicated a long period, low frequency earthquake possibly indicative of magmatically derived volcanic gas "farting" its way up to the surface. The earthquake occurred just 15 miles west of Mt. Hood's summit. It was very peculiar but there is now an update! This event has now been marked as an "explosion" by PNSN and USGS. The event type changed, but the depth changed from 5.3km in depth to 5.1km in depth. Only a 0.2km depth differential! How can an explosion occur at around 5km underground if related to quarry/mine activity? We will assess the data provided and you be the judge. It was a very odd event! Please click the title of this post or "read more".
STOP! First, if you have not seen the original blog post about these peculiar events please CLICK HERE or simply backspace and find the blog post with close to the same title as this post here. Most of the information will be in the first blog post. This is just a continuation of that post with additional data for September 24-25. Please click "read more" below.
Things are usually quiet near Oregon's version of Mount Rainier, Mount Hood. However today, September 24, 2018, something seems to have changed. A low frequency earthquake appeared near Mount Hood. Yes, you saw that correctly! A low frequency earthquake, possibly indicative of being involved with magma or magmatically derived volcanic gas, has occurred just 15 miles west of Mount Hood's summit. This is not something that is questionable. This really was a low frequency event. So what does this mean? Well this seems to have been an isolated incident, so far, and seismicity remains at low levels. But if swarms start to break out, it is probably a good idea to stay away and monitor the area. I am not saying an eruption is coming! Just that this was not glacier or tectonic activity and extremely likely to be involved with magma in some way due to the characteristics of the event. Could this be a sign that something is changing or is all as it should be? Of course low frequency events do occur from time to time at volcanoes worldwide, many times without eruptions occurring or being in danger of occurring, but it is always a good idea to pay attention to anything caused by magma. Please click this post title or "read more" to read more.
Hey guys! Some interesting stuff is happening. Nothing major, but interesting nonetheless. Ever since the small shallow earthquake swarm occurred at Mt. Rainier on September 19, there have been some interesting seismic events occurring. They are not that large with the largest event of September 23-24 being about the size of a magnitude 1.0 earthquake or so. Please click the title of this post or "read more" to read more. Data will be included of the events in question. Helicorders (the chart on which seismograms reside) of seismic stations RER, RCS, and OBSR will be shown as well.
The image above shows the location of the magnitude 2.1 earthquake that struck South Carolina at 6.2km in depth at 7:47UTC on September 22, 2018. This area is not known to be seismically active, but they still do occur. I believe right when Hurricane Florence was hitting this area, an earthquake of similar depth and size occurred. This earthquake was very weird and had a hard time showing up on local seismographs. The closest seismic station I could find data for was SUMMV CO which appears to be about 25 miles away or so. Below is the seismogram/spectrogram analysis of this event along with the helicorders of the two closest seismic stations. You can tell it barely showed. Nevertheless, it is a very interesting event!
On September 19, 2018 a fast paced but short lived earthquake swarm occurred at Mt. Rainier, inside the strato-cone itself. The origin could be related to the steam vents just inside the cone. Regardless of cause, this swarm was definitely very interesting! A very peculiar signal was also spotted just after the swarm that almost looks like a type of DLP (deep long period) event. Please watch the video below. To see the description box of this video or join in on comments on YouTube, please CLICK HERE to goto the original video on YT.
On September 21, 2018 A short lived earthquake swarm broke out near Montpelier and Soda Springs, Idaho. This location is near the epicenter of the massive late-2017 Soda Springs earthquake swarm which I have always theorized to be related to magma in some way. I mean the magnitudes were off the charts! At its peak, multiple 3.0s and 4.0s shook the area frightening all those that live in the area. We will real quick look at today's swarm and show some data. Please click "read more".
On September 21, 2018 at 20:14UTC a magnitude 2.1 earthquake at 3.2km in depth struck directly beneath the southern base of Mount Shasta in Northern California. Seismicity over the past few years has been low so this could just be an isolated incident. Nevertheless, whenever seismic changes occur at volcanoes it is probably a good idea to monitor the area anyway.
The seismogram/spectrogram shown above is from seismic station LDL_HHZ_NC_01 and is of the magnitude 2.1 earthquake that occurred today at Mount Shasta. In the first image in this post, you can see the location of seismic station LDL. You can see blatant high frequency characteristics indicative of normal volcano-tectonic earthquakes that are seen at volcanoes worldwide. No sign of volcanic activity as of yet but still should be monitored just in case. If anything changes, I will let you know. The helicorder below is from station LDL and shows the earthquake near the bottom. Have a good day!
Best to use headphones for this video!!! Link to the video below: https://www.youtube.com/watch?v=fS_cKB3JoFI&t=900s
The image directly above is of the recent 7.8 magnitude earthquake that struck Fiji at 608km in depth on September 6, 2018 at 15:49UTC. Spectrogram and seismogram taken from station MCV within Long Valley caldera.
What is going on? Isn't it weird how once the Kilauea eruptions calmed there was a good sized spike in 6.0's, 7.0's, and even 8.0's?! Also alot of the earthquakes recently of larger magnitudes have occurred very deep, around 500-600km in depth. What is going on? I understand this happens time to time, but why the large spike in 7.0's and 8.0's at such a deep depth? Has something changed beneath our feet? And how much longer will this deep-focus sequence last?
The seismogram and spectrogram plot above shows a possible low frequency event that occurred somewhere near seismic station YML, Mary Lake from 9:29UTC to 9:32UTC September 3, 2018. The first event, right before the low frequency earthquake, does not appear to be an actual earthquake. I at first thought that this "tremor" looked like wind, and it actually resembles wind in many ways. However wind cannot send a specific signal over miles and miles. Don't know what I mean? Please continue by pressing "read more".
Ben Ferraiuolo is a fast learner and someone who will always stand for the truth. Visit "About Me" for more!