In https://www.reuters.com/news/picture/pictures-report-idUSRTX7NJMH https://www.reuters.com/news/picture/pictures-report-idUSRTX... you can see ships berthed a

In https://www.reuters.com/news/picture/pictures-report-idUSRTX7NJMH https://www.reuters.com/news/picture/pictures-report-idUSRTX... you can see ships berthed after the explosion, with no visible damage (as seen from a distance, surely there must be lots of minor damage to the superstructures etc.) even though they must have been really close to the explosion. Since it was a ground level explosion, the quay and other buildings probably largely shielded the hulls of the ships from damage. Ships in general are quite sturdy things, they are made to withstand heavy seas and winds after all.