Google Android phone earthquake visualization

Sean Donelan sean at
Sat Sep 19 23:37:13 UTC 2020

As a person reminded me, Japan's earthquake/tsunami early warning 
system has been doing this faster and better than the USA for a long 
time.  And yes, the Japanese system wakes up some radios and TVs in the 

On Sat, 19 Sep 2020, Jeff P wrote:
> I was awake when it struck, and I received this alert about 3 seconds before
> the shockwave hit my location:

> On Sat, Sep 19, 2020 at 1:40 PM Sean Donelan <sean at> wrote:
>       The VP Engineering for Android posted a visualization of the 4.5
>       earthquake in
>       Southern California from data collected by Android phones.

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