( ( ( ( ( We ( ( use ( electronic tiltmeters ) ) ( for ( continuously ( ( recording ( such ( ground tilts ) ) ) ( on volcanoes ) ) ) ) ) ) , ) and ) ( they ( have ( become ( ( the ( ( most ( widely used ) ) instrument ) ) ( for ( measuring ( ( volcano ( ground deformation ) ) ( in ( real time ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (PRP We)) (VP (VBP use) (NP (JJ electronic) (NNS tiltmeters)) (PP (IN for) (S (ADVP (RB continuously)) (VP (VBG recording) (NP (JJ such) (NN ground) (NNS tilts)) (PP (IN on) (NP (NNS volcanoes)))))))) (, ,) (CC and) (S (NP (PRP they)) (VP (VBP have) (VP (VBN become) (NP (NP (DT the) (ADJP (RBS most) (RB widely) (VBN used)) (NN instrument)) (PP (IN for) (S (VP (VBG measuring) (NP (NP (NN volcano) (NN ground) (NN deformation)) (PP (IN in) (NP (JJ real) (NN time))))))))))) (. .)))
We use electronic tiltmeters for continuously recording such ground tilts on volcanoes, and they have become the most widely used instrument for measuring volcano ground deformation in real time.
(ROOT (S (NP (NNS Tiltmeters)) (VP (VBP are) (VP (VBN used) (S (VP (TO to) (VP (VB measure) (NP (NP (DT the) (NN angle)) (PP (IN of) (NP (NP (DT the) (NN slope)) (PP (IN of) (NP (DT a) (NN volcano))))))))))) (. .)))