( ( Critical experiments ) ( ( include ( ( an attempt ) ( to ( measure ( ( the formation ) ( ( fluid ( ( pressures and ) fracture ) ) ( stresses ( ( ( in and ) on ) ( ( both sides ) ( of ( the ( fault zone ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Critical) (NNS experiments)) (VP (VBP include) (S (NP (DT an) (NN attempt)) (VP (TO to) (VP (VB measure) (NP (NP (DT the) (NN formation)) (SBAR (S (NP (NN fluid) (NNS pressures) (CC and) (NN fracture)) (VP (VBZ stresses) (PP (IN in) (CC and) (IN on) (NP (NP (DT both) (NNS sides)) (PP (IN of) (NP (DT the) (NN fault) (NN zone))))))))))))) (. .)))
Critical experiments include an attempt to measure the formation fluid pressures and fracture stresses in and on both sides of the fault zone.
(ROOT (S (NP (DT A) (NN fault)) (VP (VBZ is) (NP (NP (DT the) (NN fracture)) (VP (VBN caused) (SBAR (WHADVP (WRB when)) (S (NP (NP (NNS rocks)) (PP (IN on) (NP (DT both) (NNS sides)))) (VP (VBP move))))))) (. .)))