( ( Although ( ( his work ) ( ( was ( originally calibrated ) ) ( only ( ( ( ( ( for ( these ( specific seismometers ) ) ) , ) and ) only ) ( for ( earthquakes ( in ( southern California ) ) ) ) ) ) ) ) ) ( , ( seismologists ( ( have ( ( developed ( scale factors ) ) ( to ( ( ( extend ( ( Richter 's ) ( magnitude scale ) ) ) ( to ( ( many ( other types ) ) ( of measurements ) ) ) ) ( on ( ( all types ) ( of ( ( seismometers , ) ( all ( over ( the world ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN Although) (S (NP (PRP$ his) (NN work)) (VP (VBD was) (ADJP (RB originally) (VBN calibrated)) (PP (RB only) (PP (IN for) (NP (DT these) (JJ specific) (NNS seismometers))) (, ,) (CC and) (RB only) (PP (IN for) (NP (NP (NNS earthquakes)) (PP (IN in) (NP (JJ southern) (NNP California))))))))) (, ,) (NP (NNS seismologists)) (VP (VBP have) (VP (VBN developed) (NP (NN scale) (NNS factors)) (S (VP (TO to) (VP (VB extend) (NP (NP (NNP Richter) (POS 's)) (NN magnitude) (NN scale)) (PP (TO to) (NP (NP (JJ many) (JJ other) (NNS types)) (PP (IN of) (NP (NNS measurements))))) (PP (IN on) (NP (NP (DT all) (NNS types)) (PP (IN of) (NP (NP (NNS seismometers)) (, ,) (NP (NP (DT all)) (PP (IN over) (NP (DT the) (NN world))))))))))))) (. .)))
Although his work was originally calibrated only for these specific seismometers, and only for earthquakes in southern California, seismologists have developed scale factors to extend Richter's magnitude scale to many other types of measurements on all types of seismometers, all over the world.
(ROOT (S (NP (NNS Seismologists)) (ADVP (RB originally)) (VP (VBD measured) (NP (NP (DT the) (NN intensity)) (PP (IN of) (NP (DT an) (NN earthquake)))) (PP (IN with) (NP (DT the) (JJ mercalli) (NN scale)))) (. .)))
Seismologists originally measured the intensity of an earthquake with the mercalli scale.