Which tsunami intensity scale is used as the main size parameter in NOAA global tsunami catalogues?

The tsunami intensity scale used as the main size parameter in NOAA global tsunami catalogues is the Soloviev-Imamura scale.

Unlike an earthquake magnitude scale, which estimates energy released at the source, the Soloviev-Imamura scale describes tsunami intensity from observed effects, especially inundation and the average wave height recorded along a coast. It was developed from earlier work by Russian tsunami scientist Sergei Soloviev and Japanese seismologist F. Imamura.

Global tsunami catalogues associated with NOAA’s National Geophysical Data Center have used this intensity measure to compare events across different regions and historical periods. A commonly cited relationship links increasing intensity values with roughly doubling average tsunami heights; for example, intensity 2 corresponds to an average height near 2.8 metres, while intensity 3 is near 5.5 metres.

The scale is easy to confuse with the Saffir-Simpson scale, which rates hurricane wind strength, the Beaufort scale, which describes wind force, or the Mercalli scale, which measures earthquake effects. Newer integrated tsunami-intensity proposals exist, but the Soloviev-Imamura scale remains the catalogue parameter referenced in this question.