So, it seems volcanic spasmodic tremor in Hawaii is not stopping. Sometimes it doesn't occur for almost a week, however it seems to always return. Will we continue to see these until the next eruption in Hawaii (whenever that may be)? I think it is likely. As usual, please click the title of this post or "read more" to continue...
Mauna Loa is currently experiencing heightened volcanic unrest. For this reason, the alert level has been raised to ADVISORY and the aviation color code has been raised to YELLOW. Please CLICK HERE for additional updates from HVO as they are issued.
If you wish to understand what volcanic spasmodic tremor is, and how it relates to ongoing volcanic unrest in Hawaii, please CLICK HERE.
First off, click the USGS EQ map button above to see all events reported by USGS for this time period and location. Please keep in mind HVO at volcanoes.usgs.gov (under the monitoring tab for each volcano) reports far more earthquakes than the USGS earthquake website does. Regardless, USGS does a great job at reporting most earthquakes associated with spasmodic tremor. Also, another button resides above to see the locations of all active seismic stations on the Big Island of Hawaii.
During July 16, 2019 through July 18, 2019, a total of 6 spasmodic tremor events were detected under the Big Island of Hawaii in the usual location just south of Pahala, Hawaii. They were not too strong, but the event on July 16, 2019 was one of the strongest we have seen since January 23, 2019. I emphasize the phrase "one of the strongest", seeing there have been some pretty strong ones since then.
Below I will show the usual helicorder plots, seismogram, spectrogram, and spectra plots detailing these events from the four seismic stations labeled on the map in the beginning of this post. I will also include seismic audio from station PPLD which will allow you to hear all of the spasmodic tremor events. Regarding the seismic audio, it was obtained using the IRIS Time Series source. I suggest using headphones, but please be wary of loud volume just in case! All audio is always sped up to allow you to hear it better. Enjoy!
July 16, 2019
There was only one spasmodic tremor event detected on July 16, 2019. It started at 10:50UTC and lasted approximately 42 minutes. It can clearly be seen quite strong on all 4 stations. It was not the strongest ever, but is definitely near the top of the list!
July 17, 2019
Event 1 occurred on July 17, 2019 at 09:20UTC and lasted 1 whole hour!
Event 2 occurred on July 17, 2019 at 17:44UTC and lasted around 22 minutes.
July 18, 2019
Event 1 occurred on July 18, 2019 at 04:19UTC and lasted approximately 20 minutes.
Event 2 occurred on July 18, 2019 at 04:39UTC and lasted about 27 minutes.
Event 3 occurred on July 18, 2019 at 05:38UTC and lasted approximately 31 minutes.
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.