OBSERVATÓRIO VULCANOLÓGICO E GEOTÉRMICO DOS AÇORES
O OVGA é um Centro de Ciência que desenvolve atividade de investigação aplicada e de divulgação científica na área da Vulcanologia, da Sismologia e da Geotermia.
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The Anak Krakatoa volcano in Indonesia - the so-called "Child of Krakatoa" - was formed by one of the most deadly volcanic disasters in modern history. Last year, unbeknownst to the world, it was close to unleashing something similar.
In 2018, as Anak Krakatoa violently erupted, its middle suddenly collapsed, triggering a tsunami that claimed more than 400 lives on the islands of Sumatra and Java.
When the waves reached civilisation...
How will ShakeAlert® likely perform now on a large earthquake impacting a major urban area? How much warning will you get? To answer this, let’s do a thought experiment...
30 Years Ago
U.S.Geological Survey (USGS) scientists tested the first rudimentary earthquake early warning (EEW) system in the aftermath of the magnitude (M) 6.9 Loma Prieta, California, earthquake on October 17, 1989. Although the M6.9 mainshock...
The oceans are criss-crossed by telecommunications cables, as illustrated by this graphic predicting the fiber-optic cables that will be operational by 2021, many of them (yellow) owned by private companies like Google and Microsoft. These cables could serve a dual purpose as seismic stations to monitor earthquakes and fault systems over the 70% of Earth covered by water.
Graphic courtesy of New York Times
Fiber-optic cables that constitute a global undersea...
Ash from Sierra Negra, a volcano on Isla Isabela in the Galápagos Islands, drifts across the sky during an October 2005 eruption. Researchers used satellite data leading up to a 2018 eruption at Sierra Negra to test an algorithm designed to detect signals that indicate potential volcanic unrest.
Credit: NASA image created by Jesse Allen, Earth Observatory, using data obtained courtesy of the MODIS Rapid Response Team
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