# @planetary_pan on Instagram

- **Type:** Image
- **Original URL:** https://www.instagram.com/p/CNUqwmHghYs
- **Gondola URL:** https://gondola.cc/posts/33110788-planetary-pan-instagram
- **Thumbnail:** https://img.gondola.cc/tr:w-,h-,fo-auto/postThumbnails/768f07bf85.jpg
- **Posted:** 2021-04-06T11:32:05.000+00:00
- **Account Owner:** Beth Johnson (@planetarypan) — https://gondola.cc/planetarypan

## Caption

I love a good science mystery, especially when it involves earthquakes. Back in 2018, there was an earthquake in the region of Indonesia that caused a deadly tsunami, even though it wasn’t the usual type of fault system that causes tsunami. Scientists analyzed the quake and found that although the fault is technically a strike-slip fault, where two tectonic plates slide past each other, this fault was at a steep angle, so the sudden slippage of the two plates displaced enough water to set off the tsunami.⠀
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Now a pair of earthquakes in the Alaska-Aleutian subduction zone has given rise to a new mystery. You see, the first quake made sense. It happened as subduction quakes do, with one plate slipping below the other, and it happened in an area where quakes have happened before. A lot of happening going on here.⠀
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But the second quake. Well, that one didn’t happen as expected or where a quake would even be expected.⠀
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Read my full story: https://buff.ly/31OuMT0⠀
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IMAGE: Earthquakes in Shumagin Gap region. Earthquakes shown in blue are the July 21 subduction event and its aftershocks, and the earthquakes shown in orange are the October strike-slip earthquake and its aftershocks. The July event occurred on the edge of the Shumagin Gap changing stress conditions in the gap, favoring the occurrence of the unexpected October earthquake (clearly within the gap), in a region not expected to host large earthquakes. CREDIT: Kevin Furlong, Penn State⠀
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#geology #earthquakes #seismology #planetaryscience #subduction #shumagingap #science #eart #pennstate

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## Tags

science, subduction, geology, shumagingap, earthquakes, eart, seismology, planetaryscience, pennstate

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