Today’s M 7.5 earthquake has changed the stresses within the crust surrounding the earthquake. The amount of this stress change is moderate, especially when compared with the amount of stress that is typically released during an earthquake.
This change in stress is called a change in “static coulomb stress” and a paper that discusses the fundamental factors controlling these stress increases is from Lin and Stein (2004). There is software available to the public from the USGS to perform these calculations. This software is called “Coulomb 3” and is available online here. An introduction to this software and the physics behind the calculations can be found in Stein (2003)
I read this morning that there were tsunami waves of up to 3 meters in Palu and up to 6 m in some places. Perhaps the initial waves were 2 m and subsequent runup was up to 6 m?
The 7.5 mag earthquake was inland. So what is this earthquake that caused the tsunami, since it was undersea?
M 5.2 - 106km NNW of Palu, Indonesia
2018-09-28 14:26:00 UTC
Location 0.022°N 119.576°E, Depth 10.0 km
The 7.5 mag and related earthquakes occurred in the Palu-Koro fault zone.
-- https://www.stuff.co.nz/world/asia/...rts-as-death-toll-expected-to-reach-thousandsJust 34 minutes after Indonesia was hit by another major earthquake, officials called off a tsunami warning.
-- https://www.stuff.co.nz/world/asia/107474716/earthquake-jolts-central-sulawesi-in-indonesiaOver 800 people are confirmed dead and hundreds are missing after Indonesian quake and tsunami.
-- https://www.stuff.co.nz/world/asia/...stalled-warning-system-might-have-saved-livesEarly warning system that might've prevented deaths in Indonesian tsunami stalled in testing phase for years.