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I check pages listed in Category:Pages with incorrect ref formatting to try to fix reference errors. One of the things I do is look for content for orphaned references in wikilinked articles. I have found content for some of 1987 Superstition Hills earthquakes's orphans, the problem is that I found more than one version. I can't determine which (if any) is correct for this article, so I am asking for a sentient editor to look it over and copy the correct ref content into this article.

Reference named "ISC-GEM":

• From 1992 Big Bear earthquake: ISC (January 19, 2015), ISC-GEM Global Instrumental Earthquake Catalogue (1900–2009), Version 2.0, International Seismological Centre
• From 2003 San Simeon earthquake: ISC (2014), ISC-GEM Global Instrumental Earthquake Catalogue (1900–2009), Version 1.05, International Seismological Centre
• From 1981 Westmorland earthquake: ISC (2015), ISC-GEM Global Instrumental Earthquake Catalogue (1900–2009), Version 4.0, International Seismological Centre
• From 1933 Long Beach earthquake: ISC (2015), ISC-GEM Global Instrumental Earthquake Catalogue (1900–2009), Version 2.0, International Seismological Centre, archived from the original on 2019-05-20, retrieved 2015-07-12
• From 1990 Upland earthquake: ISC (2016), ISC-GEM Global Instrumental Earthquake Catalogue (1900–2012), Version 3.0, International Seismological Centre
• From 1999 Hector Mine earthquake: ISC (2017), ISC-GEM Global Instrumental Earthquake Catalogue (1900–2013), Version 4.0, International Seismological Centre, archived from the original on 2016-11-25, retrieved 2017-02-08
• From 1987 Ecuador earthquakes: ISC (19 January 2015), ISC-GEM Global Instrumental Earthquake Catalogue (1900–2009), Version 2.0, International Seismological Centre
• From 1973 Point Mugu earthquake: ISC (2017), ISC-GEM Global Instrumental Earthquake Catalogue (1900–2013), Version 4.0, International Seismological Centre
• From 1931 Valentine earthquake: ISC (2015), ISC-GEM Global Instrumental Earthquake Catalogue (1900–2009), Version 2.0, International Seismological Centre

I apologize if any of the above are effectively identical; I am just a simple computer program, so I can't determine whether minor differences are significant or not. AnomieBOT⚡ 08:53, 21 November 2020 (UTC)[reply]