, 8 tweets, 3 min read Read on Twitter
If you’re ever on a coast & feel severe shaking, get to high ground.

Tsunami can start coming onshore before warnings are even issued. Play it safe & just get uphill FAST.

I hope this isn’t about to be a Bad News Day. Significant Indonesia quake: earthquake.usgs.gov/earthquakes/ev…
A tsunami warning is out in Indonesia: inatews.bmkg.go.id

But it’s tricky, Indonesia’s had a bad run in recent years of chaotic warnings, unclear responses (GET TO HIGH GROUND), vandalized equipment, erosion of public trust...

I hope the quake didn’t generate a tsunami.
Tsunami are generated any time you have significant disruption of the water column.

This is usually vertical motion on a fault (which happens near Indonesia), but can be things like a submarine mountain moving sideways (2018: earther.gizmodo.com/scientists-are…) or landslides in to water.
We’re really, really good at the fluid dynamics of how tsunami move, which means we can predict when they’ll show up from distant earthquakes beautifully.

But we never know how big tsunami will be until they start coming on shore. Inches? Tens of meters? TBD every time.
Here’s hoping it’s a slow news day for disasters.

Here’s hoping Indonesia got a jolt, but no tsunami was generated.

Here’s hoping that no one dies from a tsunami today; that we won’t see final moments captured on video; that we don’t add to long lists of Lessons Learned.
So far I’m seeing updates on evacuations, but no reports of tsunami coming onshore.

Need to wait a bit longer for an all-clear, but with any luck this will be a story of how Indonesia’s improved its tsunami warning & public education vs last year.
Looks like we got the best possible outcome where everyone practiced response but no tsunami came onshore.
The extremely frustrating part is now I’m a bit worried that Next Time, evacuation compliance will be lower because after all, “nothing happened this time!”

I promise: No emergency manager ever issues evacuation orders for fun.
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