Location:
7 km SW of Volcano, Hawaii
Period:
23 Dec 2024 02:22:12 - 23 Dec 2024 22:03:50 (19 hours 41 minutes)
Volcanoes in 100km radius:
Kilauea(3km), Mauna Loa(36km), Mauna Kea(51km), Kama'ehuakanaloa(53km), Hualalai(70km)
Earthquakes:
35
Seismic Activity Report: Volcano, Hawaii Region
A new seismic swarm, designated VS20241223.1, commenced at 02:22 HST on December 23, 2024. Located approximately 7 kilometers southwest of Volcano, Hawaii, the cluster has produced 24 recorded earthquakes within its initial 10 hours and 37 minutes of activity. This event adds to a robust historical dataset of seismic occurrences in the region, which has been systematically monitored since the turn of the millennium.
Geological Context and Regional Seismicity
The region southwest of Volcano, Hawaii, is situated within one of the most seismically active zones on Earth, defined by the complex interplay between the Kilauea and Mauna Loa volcanic systems. The seismicity in this area is primarily driven by three distinct geological processes: magmatic intrusion, gravitational instability of the volcano’s flanks, and regional tectonic adjustments.
Magmatic activity is the most frequent trigger for earthquake swarms in this vicinity. As magma migrates through the subsurface plumbing systems of Kilauea, the resulting pressure changes induce rock fracturing, manifesting as swarms of small-magnitude earthquakes. These events are often precursors to volcanic eruptions or significant shifts in the subterranean magma reservoir. Furthermore, the southern flanks of Hawaii’s volcanoes are subject to constant seaward displacement. This "flank creep" is facilitated by the presence of a weak layer of sediment and volcanic debris at the base of the volcanic edifice, where it meets the oceanic crust. As the volcano grows, the weight of the mountain forces the flank to slide, generating persistent, low-magnitude seismic swarms.
Historical Statistical Analysis
Since January 1, 2000, the region has experienced 88 distinct seismic swarms. An analysis of the temporal distribution reveals a significant escalation in frequency over the last two decades. While the early 2000s saw sporadic activity—such as three swarms in 2000 and a single event in 2001—the data indicates a marked increase in recent years. Notably, 2023 was a peak year, recording 17 individual swarms, while 2024 has already documented 9 swarms, including the current VS20241223.1 event.
The magnitude distribution of these events underscores the nature of Hawaiian seismicity. Between 2000 and the present, the region recorded 85,241 earthquakes with magnitudes below 5.0. These events are typically associated with the brittle failure of volcanic rock under stress. Conversely, larger events are less common but geologically significant; 61 earthquakes within the 5.0 to 5.9 magnitude range have been recorded in the same period. These larger events are usually linked to deeper crustal adjustments or major structural failures of the volcanic edifice, often occurring along the décollement—the basal fault plane where the volcanic pile sits atop the seafloor.
Monitoring and Risk Assessment
The ongoing swarm is being closely monitored by the Hawaiian Volcano Observatory (HVO). The rapid onset of 24 earthquakes in under 11 hours is consistent with historical patterns observed during periods of heightened magmatic or tectonic stress. While the vast majority of these events are below magnitude 5.0, they provide essential data for geophysicists to map the current state of stress within the crust.
Understanding these swarms is critical for hazard mitigation. By correlating swarm frequency and location with ground deformation data (measured via GPS and InSAR), researchers can distinguish between routine flank movement and the more hazardous migration of magma toward the surface. As the VS20241223.1 swarm continues to evolve, HVO scientists will continue to assess whether this activity represents a localized adjustment or a signal of broader volcanic unrest. The historical consistency of these swarms serves as a reminder of the dynamic, ever-changing nature of the Hawaiian landscape, where seismic monitoring remains the primary tool for anticipating volcanic hazards.