What caused the waves?

To this point we had established that there was a tsunami that affected one small bay on the southwestern shore of Fatu Hiva. Its effects appeared to be very localized, with only small waves reported at Hanavave a few km to the north and no wave activity reported on other islands (Note: a conversation with a sailboat crew member then on Tahiti, revealed that a warning to boats was given throughout the Marquesas Islands. The crewman said that upon hearing the report they immediately raised anchor and went for deeper water for the rest of the day. He saw no wave activity.)

However, on the second day of our trip, a local fisherman gave us an important clue...

Gee, maybe this had something to do with the tsunami!

A fisherman from Hanavave reported that in the afternoon after the wave was observed in Omoa, he was out fishing on the south side of the island. He said that a large portion of the cliff had fallen off. We visited the area on our second day on Fatu Hiva. The reports were true, there was a spectacular, very fresh landslide scar on a southerly facing cliff. Estimates of the size are given on the image below. We estimate the volume to be between 1 and 5 million cubic meters.

 

A snapshot of landslides over time on Fatu Hiva.

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