Dramatic earthquake increase in Hawaii! Jump from 60 to 600 per week in just 5 years in Pahala

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Earthquakes increase from 60 to 600 per week in just 5 years in Pahala, Hawaii
Earthquakes increase from 60 to 600 per week in just 5 years in Pahala, Hawaii. The location of permanent and temporary seismic instruments deployed across the southeast part of the Island of Hawai‘i. Shaded white areas show dense regions of earthquakes interpreted as the Pāhala sill complex. Dashed white box outlines a region of sparsely spaced volcano-tectonic earthquakes that lie between the Kīlauea summit and Pāhala. via USGS

Pāhala, a town located in the southeast part of the Island of Hawai’i, lies above the state’s most seismically active area. In the last 5 years, the average weekly number of earthquakes has increased from about 60 to 600 earthquakes per week.

These frequent earthquakes occur deep beneath the Pāhala region at approximately 20 to 40 km (12 to 25 miles) depth. Larger events are regularly felt by residents living both within Pāhala and across the island.

In a 2015 study, scientists at USGS located and classified earthquakes in this region into two main groups.

A more continuous seismic tremor, a type of signal often used to trace the movement of magma within a volcanic system, was identified at approximately 40 km (25 miles) depth, both on- and off-shore of the Pāhala region. This activity was interpreted as the migration of magma from the deep Hawaiian hot spot to more shallow depths.

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Above this deep region of seismic activity, a zone of volcano-tectonic (VT) earthquakes (indicative of rock breaking) was observed extending from this tremor region to deep beneath Kīlauea. Based on the linear trend of this seismicity, USGS scientists suggested that this distribution of earthquakes marked a path of magma migration underground from storage below Pāhala towards Kīlauea summit. However, evidence supporting this hypothesis was limited to one chain of VT events.

A recently released study by seismologists at the California Institute of Technology (CalTech) sheds new light on the processes occurring deep beneath Pāhala. These scientists have employed newly developed machine learning (computer systems that analyze large data sets and identify major patterns within the data) to identify a large number of extremely small earthquakes (microseismicity) occurring beneath the Pāhala region that were previously uncatalogued by the Hawaiian Volcano Observatory. Such microseismicity is too small to be identified using automated methods typically employed to detect earthquakes.

Earthquakes increase from 60 to 600 per week in just 5 years in Pahala, Hawaii
Earthquakes increase from 60 to 600 per week in just 5 years in Pahala, HawaiiEarthquakes increase from 60 to 600 per week in just 5 years in Pahala, Hawaii… The location of permanent and temporary seismic instruments deployed across the southeast part of the Island of Hawai‘i. Shaded white areas show dense regions of earthquakes interpreted as the Pāhala sill complex. Dashed white box outlines a region of sparsely spaced volcano-tectonic earthquakes that lie between the Kīlauea summit and Pāhala. via USGS

Many of these events are VT earthquakes located within the zone of deep Pāhala seismicity previously identified by USGS scientists. This large number of newly identified VT events outline what appears to be a region of horizontally layered magma storage deep beneath Pāhala, called a sill complex.

Further supporting this idea, long period earthquakes (indicative of the movement of fluids such as magma) are seen occurring within these sills. Together, these observations demonstrate that deep seismicity beneath Pāhala is consistent with the migration and storage of magma within this sill complex.

The CalTech study also identified a limited number of VT events extending from the sill complex into the region of magma storage beneath Kīlauea summit. The authors suggested that this distribution of earthquakes may represent a possible magma pathway from the deep Pāhala sill complex into Kīlauea’s magma storage reservoir. However, more evidence is needed to support or refute this hypothesis.

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The Hawaiian Volcano Observatory (HVO) is undertaking two large seismic experiments in the region to better understand seismic and volcanic activity in the Pāhala and Kīlauea regions. In the summer of 2022, 86 temporary seismic instruments were deployed across Pāhala to record earthquakes occurring within this region for three months. In the summer of 2023, approximately 1600 temporary seismic instruments are proposed to be deployed across Kīlauea summit to record seismic signals for six weeks.

These dense, temporary deployments will record seismic activity across the Kīlauea and Pāhala regions more accurately than HVO’s permanent network of instruments. Seismologists at HVO will analyze these seismic data to understand whether magma stored within Pāhala’s active sill complex is connected to, and therefore a source of magma for Kīlauea volcano.

Kīlauea volcano’s summit eruption in Halemaʻumaʻu crater within Hawai’i Volcanoes National Park continues, with vents erupting in the central eastern portion of the crater floor. Summit tilt has shown several deflation/inflation trends over the past week. Summit earthquake activity remains low and eruptive tremor (a signal associated with fluid movement) is present. A sulfur dioxide emission rate of 3,500 tonnes per day was measured on January 9.

Mauna Loa is not erupting. Its USGS Volcano Alert Level is at ADVISORY. Mauna Loa updates are issued weekly on Thursdays.

Webcams show no signs of activity on Mauna Loa. Seismicity remains low. Ground deformation rates and sulfur dioxide (SO2) emission rates are at background levels.

HVO continues to closely monitor the ongoing eruption at Kīlauea, and Mauna Loa. [USGS]

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9 Comments

  1. Don’t forget about the menehunes. Island people will tell you stories about them. I remember this old guy Mokie told us stories when we were kids. Pretty scary stuff. He could have been pulling our leg, but the islanders believe in them. So, some of the folklore could be true as well.

  2. Which actually proves Nibiru exists. Notice they don’t ban the con man at Geoengineeringwatch? That’s because he is part of their team to confuse and divert away from what’s real. Something to blame the extreme weather on that makes them appear more powerful.

  3. Solar minimum and excited magma. That’s why I have avoided island paradises. Too many chances to get torched and rattled. At one point (20 years ago), Costa Rica was looking good, but then I saw that volcano and shitcanned that idea. Now, they have crime problems according to somebody who was also thinking about Costa Rican paradise.

    • Good observation. Guess it goes completely under during the Pole Shift. Most of Central American. Just some mountain tops above water.

    • Yes, he was. The increases in EQs worldwide is being covered up. They don’t want people to get alarmed and start asking questions. Might find out what they are hiding from us.

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