About: http://webisa.webdatacommons.org/397856729

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Sometimes the date is imprecise, for example only quoting October 1901, others gave no instrument and often only the date and magnitude were quoted.
http://www.w3.org/ns/prov#wasQuotedFrom	cam.ac.uk