Assertion: tsunami buoy | /r/HasProperty | placed deeper than 3000m
Facets:
value: to ensure
type: PURPOSE
value: in water
type: LOCATION
value: ideally
type: DEGREE
Source sentences:
text: In addition, tsunami buoys must ideally be placed in water deeper than 3000m to ensure the observed signal is not contaminated by other types of waves that have shallower effects (e.g. surface wind-waves).