Landslide warnings based on landfall-inducing precipitation on susceptible land on 08/26/18. 

The global Landslide Hazard Assessment for Situational Awareness (LHASA) model is developed to provide situational awareness of landslide hazards for a wide range of users. Precipitation is a common trigger of landslides. The GPMIntegrated Multi-satellitE Retrievals for GPM (IMERG) data shows recent precipitation, updated every thirty minutes. A LHASA landslide “nowcast” is created by comparing GPM data from the last seven days to the long-term precipitation record provided by the Tropical Rainfall Measuring Mission (TRMM) Multi-satellite Precipitation Analysis (TMPA).
 
The past 7 days of rainfall are considered, with each day is weighted according to their date before present, with the last twenty-four hours having the most impact.
In places where precipitation is unusually high, the susceptibility of the terrain is evaluated, which includes quantitative information on if:
roads have been built;
trees have been cut down or burned;
a major tectonic fault is nearby;
the local bedrock is weak;
the hillsides are steep.
 
Depending on the susceptibility, one of three things happens:
 
If the terrain is not very susceptible to landslides (e.g. it’s very flat), no nowcast will be issued;
If the terrain is moderately susceptible, a “moderate-hazard” nowcast will be issued. This area is shown as yellow on the map;
If the terrain is highly susceptible (e.g. it’s very steep, and the forest has burned down), a “high-hazard” nowcast will be issued. This area is shown as red on the map.

Landslide Alerts 08/26/18

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