Phys.org October 25, 2023 An international team of researchers (USA – UT Austin, Pennsylvania State University, University of Nevada, Italy) measured waveform similarity and pairwise differential travel-times (DTT) between acoustic emission (AEs) throughout the seismic cycle. AEs broadcasted prior to slow labquakes had small DTT and high waveform similarity relative to fast labquakes. They showed that during slow stick-slip, the fault never fully locked, and waveform similarity and pairwise differential travel times did not evolve throughout the seismic cycle. In contrast, fast laboratory earthquakes were preceded by a rapid increase in waveform similarity late in the seismic cycle and a […]
Tag Archives: Seismology
Stratospheric balloons listen in on ground activity
Phys.org November 16, 2021 Earthquakes, volcanic eruptions, and even severe weather events produce a medley of low-frequency infrasound waves below the range of human hearing. Infrasound waveforms generated by natural and anthropogenic phenomena contain important clues about the size and nature of the event. A team of researchers in the US (Sandia National Laboratory, Caltech) has shown that sensors on balloons in the lower stratosphere can record faithful representations of the near-source acoustic wave field at unprecedented range. The acoustic signature of a buried chemical explosion recorded at a range of 56 km and an altitude of 21.8 km was […]
A Mysterious Seismic Wave Recently Shook Earth, And Scientists Can’t Explain It
Science Alert November 29, 2018 While the cause of this mysterious disturbance remains unknown, it’s somehow linked to an ongoing seismic swarm that’s been rumbling the archipelago of Mayotte in the Indian Ocean for several months. The researchers’ best guess is the anomalous vibration was also linked to volcanic activity, perhaps due to a huge movement of magma under the Indian Ocean. GPS readings indicate that since July – after the swarm began – the island has shifted approximately 60 mm (2.4 in) to the east and 30 mm (1.2 in) south. According to one analysis, this movement could be due […]