Glossary

Words used on this site, in plain language.

Risk level (Low, Warning, Danger, Critical): Our summary of how concerning conditions are in a place right now. Low means normal. Critical means a serious situation is likely happening or about to.
Risk index: The number behind the risk level, from 0% (calm) to 100% (severe). It blends river, rain, ground and earthquake signals.
N.A.M. (Not Actively Monitored): A place we keep an eye on using public records, but whose risk we do not measure around the clock yet. N.A.M. places have no alerts.
Activity score: For N.A.M. places: how active the area has been recently, based on past earthquakes and river records. It describes history, it is not a live alarm.
River × typical: How the river compares with its usual level. "2× typical" means it carries twice as much water as normal for this season.
Observed vs. model: Observed means measured directly (rain, air quality, earthquakes). Model means computed by a scientific simulation (river flow, soil moisture). Both are real data; a model is an estimate.
SIMULATED: Marked on anything we created artificially for a demonstration. Simulated events are never real warnings.
M (as in M 6.1): Earthquake magnitude. Each whole step releases roughly 32 times more energy. M 4 to 5 is usually felt; M 6 and up can damage buildings; M 7 and up is a major earthquake.
Epicenter: The point on the surface directly above where an earthquake started.
Soil moisture: How wet the ground is. Saturated ground makes floods and landslides more likely.
Air quality (UAQI): The Universal Air Quality Index, a standard scale for how clean or polluted the air is. We show it with a plain category, such as Good or Poor.
River monitoring point: The exact spot on the river our measurements describe. It can be a few kilometers from the city center, on the river itself.