setting vs-k to that for 2.0s if T>2
setting vs-k to that for 2.0s if T>2


Former-commit-id: d30d2f0360df5a560959140db7d86a1cb19251e7
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine