The interpretation of a 5 depression sequence depends on a few details to be observed:

1. Time sequence

structural defects are refilled in part with ejecta from a relatively younger effect. Bottom current show steady direction and transport regime due to current ripples developed. So this disturbance has to be accounted for too.

2. crater s…

Are there any metal samples from the pipes available?Much of the deformation in the NS1 failure area indicate a not too brisant somewhat distant charge with comparatively long coupeling phase. Meanwhile the damage on NS2 suggests a close contact charge of defined localized energy release. again Confirmation can only be achieved by proper metallographic investigation here.