April List of earthquakes in 1968
^ m 7.5 - shikoku, japan . united states geological survey. april 1, 1968. retrieved may 18, 2017.
^ significant earthquake: japan: kyushu, shikoku . national geophysical data center. april 1, 1968. retrieved may 18, 2017.
^ m 6.8 - shikoku, japan . united states geological survey. april 1, 1968. retrieved may 18, 2017.
^ m 6.6 - 5km nne of ocotillo wells, ca . united states geological survey. april 9, 1968. retrieved may 18, 2017.
^ borrego mountain earthquake . caltech. april 9, 1968. retrieved may 18, 2017.
^ m 6.2 - samoa islands region . united states geological survey. april 26, 1968. retrieved may 18, 2017.
^ m 6.1 - michoacan, mexico . united states geological survey. april 26, 1968. retrieved may 18, 2017.
^ significant earthquake: iran: maku,shah bandalu,qurta bolagh,qondeqli . national geophysical data center. april 29, 1968. retrieved may 18, 2017.
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