Well, it has been over 3 weeks since the last moderate to major spasmodic tremor swarm hit the Big Island of Hawaii. However, on June 25-26, 2019, volcanic spasmodic tremor has returned to the Big Island! It was not as strong as previous spasmodic tremor this year, however it was a resurgence nevertheless. I will show seismic plots from 4 select seismic stations across the Big Island and I will also include seismic audio for each event. Please click on the title of this post or "read more" to continue...
First off, the USGS EQ map button above will show all USGS reported events for June 25 through June 26, 2019. Another button is provided that details the locations of all seismic stations on the Big Island of Hawaii.
On June 25, 2019, one volcanic spasmodic tremor event occurred in the usual location around the usual depth. I have talked about these events numerous times on my YouTube channel, my Seismo-Blog, and my Hawaii blog here. These volcanic spasmodic tremor events are deep and signify mass magma transport along the mantle plume conduit, feeding magma likely into numerous reservoirs on the Big Island. However, most of the magma is likely being transported into Mauna Loa's reservoir and Kilauea's East Rift Zone reservoir, with maybe even additional magma feeding the Kilauea summit reservoir itself. If you wish to learn more about these volcanic spasmodic tremor events, please preview my previous posts on my Hawaii blog here and also on my "Seismo-Blog".
Uplift continues at both Mauna Loa, Kilauea, and the Kilauea East Rift Zone. However, and it is just my personal opinion, I believe Mauna Loa will be the next volcano to erupt on the Big Island.
As I said, June 25 saw one spasmodic tremor event. June 26, 2019, however, saw 4 distinctly separate events. Some were closely spaced in time as well, making this a "spasmodic tremor swarm" as I like to call it. The recent spasmodic tremor was relatively weak compared to previous dates this year. Regardless, it is something to monitor closely since it is directly connected to magma recharge from the mantle plume underneath the Big Island.
As you can see below in slideshow format, there was one spasmodic tremor event on June 25. I will detail this in just a bit with the usual seismic plots and audio:
Here are the helicorder plots for June 26, 2019. You can clearly see multiple volcanic spasmodic tremor events:
Now I will show the seismic plots to all of the events from June 25 through June 26, 2019. It will be in gallery format so please click on an image to enlarge it. I will also include seismic audio beneath each event's plots. Please use your headphones to hear it best. However, please be wary of the volume just in case! Seismic audio is obtained from IRIS and will always be sped up quite a bit to make the frequencies audible to the human ear. Enjoy!
Event #1 occurred on June 25, 2019 at 5:49UTC and lasted approximately 42 minutes.
The rest of the plots are from June 26, 2019:
Event #2 occurred at 4:50UTC and lasted approximately 42 minutes.
Event #3 occurred at 15:17UTC and lasted approximately 25 minutes.
Event #4 occurred at 15:55UTC and lasted approximately 37 minutes.
Event #5 occurred at 17:22UTC and lasted approximately 26 minutes. This was the largest spasmodic tremor out of all shown in this post.
This blog is specifically for activity that occurs in Hawaii. In light of 2018's eruptions on the Big Island, I felt it necessary to have a section entirely devoted to events in Hawaii. I now mostly use this blog to update people on volcanic spasmodic tremor which occurs deep within the mantle plume conduit(s) under Pahala, HI. Don't know what spasmodic tremor is? Don't fret! Simply go to the Hawaii menu and click the page about Hawaii Spasmodic Tremor.