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Satellite view shows Raoul Island before and after quakes, tsunami
10 Mar, 2021 04:35 AM
6 minutes to read
Footage shows tsunami waves hitting New Zealand. Video / Claudia Maaka / Waiapu Civil Defence / Gina Pewhairangi / Dean Purcell
Footage shows tsunami waves hitting New Zealand. Video / Claudia Maaka / Waiapu Civil Defence / Gina Pewhairangi / Dean Purcell
It comes as GeoNet has published data from tidal gauges, showing how a tsunami reaching up to 40cm high was measured at Great Barrier Island soon after the events.
This afternoon, University of Auckland coastal geomorphologist Dr Murray Ford tweeted a before-and-after satellite view of Raoul Island.
The first decent cloud free image of Raoul Island after the 8.1 quake and tsunami last week. Lots of landslides. @NZNavy HMNZS Canterbury anchored just offshore with @gnsscience and @MetService team. Images captured by @planetlabspic.twitter.com/Pa9Sqdp182 Murray Ford (@mfordNZ) March 10, 2021
Mar 8, 2021
The blue arrows on the map splay out like uncooked spaghetti tossed into a pot as geophysicist Jonathan Bedford presses play.
Ten years after the March 11, 2011, Great East Japan Earthquake which upended long-held views about where megaquakes were likely to strike scientists like Bedford, a researcher with the GFZ German Research Center for Geosciences in Potsdam, are developing new tools to better understand the threat, while others are digging deep into the past in a search for geological clues.
Each arrow on Bedford’s animated analysis represents tiny movements over time most at a speed of well under 1 millimeter per day of the Japanese archipelago, as detected by the thousands of highly accurate GPS stations that dot one of the world’s most seismically active countries. Red circles spring up now and then to mark an earthquake.
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It will soon mark ten years since the Great East Japan Earthquake. Various regions in the Japanese islands are fraught with the risk of major earthquakes.
The government periodically announces predictions of earthquake probabilities, and if we are able to understand the system and utilize the information, it can contribute to disaster mitigation.
Impact of Megaquake of the Coast of Northern Japan was quantified in recent Cabinet Office study
The earth’s surface is covered with dozens of huge bedrock plates. Because the mantle beneath them is convected by the high heat of the planetary body’s interior, the plates move in all directions as they push and pull at each other.
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