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#seismology

3 posts3 participants0 posts today
Public
Doug Bostrom

Who doesn't like a two-fer?

"In this feasibility study we investigate if vocalising near-coastal fin whales can be widely detected and located with onshore seismometers... we establish that fin whale song can be detected with onshore seismometers up to 5.5 km inland, across multiple marine environments, globally. Individual creatures can be located and tracked through the analysis of seismic wave properties."

#RPi Easter Egg therein.

#ceteaceans
#seismology

nature.com/articles/s41598-025

NatureFin whale song recordings by onshore seismometers open new horizons for cetacean coastal monitoring - Scientific ReportsFin whales, the second largest animal on Earth, produce one of the most intense vocalisations in the animal kingdom. Monitoring these songs using ocean-deployed hydrophones plays an important role in the study of fin whale distribution and social behaviour, though obtaining real-time data remains challenging. In this feasibility study we investigate if vocalising near-coastal fin whales can be widely detected and located with onshore seismometers. Inspecting data from pre-existing seismic installations we establish that fin whale song can be detected with onshore seismometers up to 5.5 km inland, across multiple marine environments, globally. Individual creatures can be located and tracked through the analysis of seismic wave properties. Furthermore, we show that citizen science seismometers, such as the affordable and widely deployed ‘Raspberry Shake’ devices, can reliably detect fin whale song. These instruments, often placed in coastal areas, provide real-time data, offering a cost-effective and accessible method for monitoring coastal fin whale activity. The revelation that human living spaces are ensonified by fin whale song offers the potential to enhance public engagement with the oceans and presents new opportunities for global monitoring. Fin whales are vulnerable to noise pollution, shipping strikes and entanglement in fishing gear. The use of terrestrial seismometers could improve early warning systems and contribute to richer datasets on near coastal whale vocalisations. This study demonstrates that, globally, seismic data holds significant untapped potential for near-coastal fin whale monitoring.
Public
readbeanicecream

Scientists puzzled by Earth's 'heartbeat' that causes slight tremors every 26 seconds

All explanations including ocean waves, volcanoes, and fractured sediments have been ruled out, leaving the mystery behind seismic tremors every 26 seconds unsolved.

good.is/scientists-puzzled-by-

GOOD · Scientists puzzled by Earth's 'heartbeat' that causes slight tremors every 26 secondsBy Neha B.
#science#earthscience#planetaryscience
Public
Jascha Polet

This is just speculation on my part at the moment, but maybe the deep basin under Bangkok could have caused a seismic resonance of the surface waves from the M7.7 Myanmar #earthquake?
In a manner similar to the resonance in Mexico City due to subduction earthquakes at significant distance.
#seismology #geology

geoenvironmental-disasters.spr

SpringerOpenPreliminary analysis of amplified ground motion in Bangkok basin using HVSR curves from recent moderate to large earthquakes - Geoenvironmental DisastersBackground The Bangkok Basin has been known from non-instrumental observations of the local population to be subject to ground motion amplification due to the deep alluvial sediments and basin geometry. This study analyzes available seismic data to confirm that basin effects are significant in the Bangkok Basin. The paper contributes to the evaluation of basin effects by characterizing the engineering ground motion parameters and HVSR curves for the Bangkok basin which produce lengthening of ground motion duration with respect to nearby rock sites, albeit with very low ground motions. For this purpose, we analyzed ground motion records from seismic stations located within the Bangkok alluvial basin from 2007 to 2021. Recorded peak horizontal ground acceleration (PGA) for seismic stations inside the basin always exceeded 1 cm/s2 during eight earthquakes with Mw ≥ 5.5. Of these, two were intraslab events and six were shallow crustal earthquakes. These recorded ground motions shook high-rise buildings in Bangkok even though their epicentral distance exceeded 600 km. Methods Several time and frequency domain analyses (such as analysis of residual, HVSR, Hodogram plots, etc.) are used on the ground motion records in the Bangkok basin to determine the frequency content of recorded ground motion and to demonstrate the significance of surface waves induced by the deep basin in altering the engineering ground motion amplitudes. In addition, centerless circular array microtremor analysis is used to determine the depth of sedimentary basin to the bedrock. Results Based on comparisons from those stations located outside the Bangkok basin, we observed the capability of alluvial deposits in the Bangkok basin to amplify ground motion records by about 3 times. We observed that there is a unique site amplification effect between 0.3 and 0.1 Hz due to local surface waves and other moderate amplifications between 2 and 0.5 Hz due to a soft layer like other deep alluvial basins in other metropolitan areas. Conclusion We noticed that there is a unique site amplification effect between 0.1 and 0.3 Hz and smaller peaks around 2 and 0.5 Hz consistent with expectations for site amplification effects associated with deep basins. Moreover, we noticed the presence of low frequencies content of the surface wave generated within the basin which deserved further studies using the 2D/3D ground motion modelling through basin topography and velocity models.
Public
Nicole Sharp

Slipping Ice Streams

The Northeast Greenland Ice Stream provides about 12% of the island’s annual ice discharge, and so far, models cannot accurately capture just how quickly the ice moves. Researchers deployed a fiber-optic cable into a borehole and set explosive charges on the ice to capture images of its interior through seismology. But in the process, they measured seismic events that didn’t correspond to the team’s charges.

Instead, the researchers identified the signals as small, cascading icequakes that were undetectable from the surface. The quakes were signs of ice locally sticking and slipping — a failure mode that current models don’t capture. Moreover, the team was able to isolate each event to distinct layers of the ice, all of which corresponded to ice strata affected by volcanic ash (note the dark streak in the ice core image above). Whenever a volcanic eruption spread ash on the ice, it created a weaker layer. Even after hundreds more meters of ice have formed atop these weaker layers, the ice still breaks first in those layers, which may account for the ice stream’s higher-than-predicted flow. (Image credit: L. Warzecha/LWimages; research credit: A. Fichtner et al.; via Eos)

A researcher holds a polished ice core containing a thin layer of ash.
#fluidDynamics#geology#geophysics
Public
formuchdeliberation

Trinidad & Tobago Express Newspapers: What’s happening at the Piparo Volcano?…

The University of the West Indies (UWI) has set up instruments at the site of the Piparo mud volcano to monitor volcanic activity, as residents continue to complain of rumblings from the vents close to their homes... #mudvolcano #trinidadandtobago #UWI #seismology

formuchdeliberation.wordpress.

for much deliberation · Trinidad & Tobago Express Newspapers: What’s happening at the Piparo Volcano?…The University of the West Indies (UWI) has set up instruments at the site of the Piparo mud volcano to monitor volcanic activity, as residents continue to complain of rumblings from the vents clos…
Public
MediaFaro News Digest

Naples residents camp outdoors after an overnight earthquake.

Many people in and around the Italian city of Naples have spent the night on the streets and in their cars after an earthquake shook buildings and brought rubble crashing down.

Italian seismologists said the 4.4 magnitude tremor struck at 01:25 local time on Thursday at a shallow depth of three kilometres. The US Geological Survey measured it as a 4.2 tremor 10km deep.

mediafaro.org/article/20250313

Naples sits on the Phlegraean Fields, a volcanic basin that makes the area in southern Italy prone to quakes. | Getty Images
BBC · Naples residents camp outdoors after an overnight earthquake.By Jaroslav Lukiv
#Italy#Earthquake#Naples
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