Mystery foam fills the streets after earthquake strikes Japan
Megan Specia | Mashable
Apr 15, 2016
http://on.mash.to/1SRclyU

[snip]

A strange sea of bubbles filled streets in a southern Japanese city in the early hours of Saturday morning, after an earthquake and several aftershocks rattled the south of the country.

In the Tenjin area of Fukuoka city, motorists and pedestrians made their way through the foamy mess after it spilled out onto the streets.

Some reported that an underground pipe burst, releasing the material, but little information was immediately available.

An earthquake rattled the area shortly before the foam appeared in the street, leading many to believe the weird white substance was linked to the quakes.

Caption: 天神が謎の泡?
(Romanized: Tenjin ga nazo no awa)
English: The Tenjin mystery bubbles