bounded weak echo region

fractured weak zone

weak echo area

weak echo areas

weak echo region

weak echo vault

WEAK ZONE

clear zone zone

trade-wind zone [= zone of trade wind]

Bounded Sum and Bounded Product

combined echo ranging echo sounding

ECHO virus ECHO

air distribution on a zone by zone basis

damage zone kill zone

near zone to far zone transformation

north-south seismic zone (N-S seismic zone)

the alternative occurrence of fractured zone and non-fractured zone

Time-domain near-zone to far-zone transformation

zone by zone upgoing