September has been a very active month for Long Valley Caldera. Starting on September 13, a fairly intense period of seismicity started primarily around the eastern section of Mammoth Lakes, which resides in the SSW section of Long Valley Caldera. The magnitudes were not large, not surpassing M3.0, but the quantity of events were substantial in the short period of time they occurred. Please click the title of this post or "read more" to see some information about recent swarming at Long Valley Caldera.
Start on Sept. 1, 2019, seismicity started to increase under the ESE base of Mt. Shasta. Only a few small quakes struck not surpassing M2.1. However, on Sept. 2, three large bursts of seismicity were detected in the same location at Mt. Shasta. The entire swarm, including the 3 bursts, was not large compared to other locations around the United States. But it was a major swarm for Mount Shasta especially when Shasta rarely sees much seismicity.
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During July 8-10, 2019, an extremely energetic earthquake swarm broke out at Mt. Hood. Swarms at Mt. Hood, especially in this location, are quite common. However, they usually do not carry this much energy in such a short time frame. Most swarms in the past are part of local tectonics, but the characteristics of this swarm may indicate something more. Please click the title of this post or "read more" to continue...
Long Valley Caldera, a super-volcano which resides in Eastern California, saw a extremely intriguing rapid-fire swarm on June 15-16, 2019. These types of swarms are my favorite and are more prevalent at Yellowstone Caldera in Wyoming than Long Valley Caldera in Cali. This earthquake swarm was spaced into two episodes: one occurring early in the morning local-time on June 15 and the other burst occurred late at night on June 15 as well. I usually label dates/times by UTC, not PST, which is ahead of PST by about 7 hours. This post will contain seismic plots pertaining to this cool earthquake swarm. Please click the title of this post or "read more" to continue...
In this post I am going to discuss and show the details of an extremely peculiar rapid-fire earthquake swarm that just recently struck north of Green River in southwest Wyoming. This earthquake swarm was a rapid fire swarm, kind of like the ones seen from time to time near West Thumb Lake and Yellowstone Lake at Yellowstone, and is one of the craziest and coolest swarms I have ever had the chance to analyze. However a big difference is that this swarm, with magnitudes reaching around 3.0-3.2, contained many low frequency earthquakes. Sometimes the low frequency events were happening in such close proximity that they blended to create a type of low frequency tremor, which is what volcanic tremor is theorized to be made of. It is highly peculiar this type of earthquake swarm, with these magnitudes and this amount of energy, would even dare to strike in SW Wyoming. This was for sure a strange one and this post will detail as much as possible. Please click the title of this post or "read more" to continue, if you have not done so already.
During October 22-23, 2018, a large earthquake swarm struck off the northern tip of Vancouver Island. Actually, this swarm occurred extremely close to the epicenter of the smaller swarm that struck on February 13-14, 2019. This swarm I will talk about in this post contained many M4's, some M5's, and 3 earthquakes above M6.0. The 3 earthquakes above M6.0 were reported as M6.5, M6.8, and another M6.5 just after the 6.8. Sadly, the depths were not constrained on any of these earthquakes so all of the earthquakes have a depth set to 10.0km in depth. Obviously it is impossible all of the 14 events occurred exactly at that depth, so it is sad that we cannot add that part of the analysis into the equation. Also, this is likely the largest earthquake swarm this area has seen. Although, as seen below, many M6.0 and above earthquakes have struck since the early-1900s, this has the highest concentration and magnitude of any other swarm in this location since the early-1900s. I could be wrong, but that is what it is looking like! In this post I detail much of the swarm via seismic images and plots. If you haven't already, please click the title of this post or "read more" to continue.
During late February 13th into the 14th, a strange earthquake swarm appeared under the northern section of the Cascadia Subduction Zone, off the coast of the northern tip of Vancouver Island. It is interesting to note, as seen in the image above, that some swarming has been occurring off and on both near the northern and southern ends of the Cascadia Subduction Zone. The largest earthquake of the Feb. 13-14, 2019 swarm off Vancouver Island was first reported to be a magnitude 4.8, later upgraded to a magnitude 5.3. Although only 2 earthquakes were reported, which is too small to be considered a swarm, there were at least 28 other earthquake events I was able to detect using P wave cross correlation and studying the characteristics of the events themselves. To continue this post, please click the title or "read more" if you have not done so already.
February 7, 2019 Swarm Strikes East of L.A. in Cali! Right next to Pisgah Crater and Lavic Volcanic Field!
Welcome to the first post on another new page just recently added to my website! This first post will deal with a very energetic, rapid fire swarm that struck east of Los Angeles on February 7, 2019. This swarm seems to be similar to the ones seen at West Thumb Lake in Yellowstone from time to time (CLICK HERE for that). This swarm also occurred very close to Lavic Volcanic Field and the Pisgah Cinder Cone. As usual, please click the title of this post or "read more" to continue...
This blog page is solely for interesting earthquake swarms that occur in locations other than the ones I already have posted. Pretty much any earthquake swarm I am interested in, that cannot be placed on other pages, will be placed here. Please click the title of each post or "read more" to view each swarm.