<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML xmlns:o = "urn:schemas-microsoft-com:office:office"><HEAD> <META content="text/html; charset=US-ASCII" http-equiv=Content-Type> <META name=GENERATOR content="MSHTML 8.00.6001.18928"></HEAD> <BODY style="FONT-FAMILY: Arial; COLOR: #000000; FONT-SIZE: 10pt" id=role_body bottomMargin=7 leftMargin=7 rightMargin=7 topMargin=7><FONT id=role_document color=#000000 size=2 face=Arial> <DIV>Well, clearly there was a rather major event involved, but the answer to the question "Has Riverside _ever_ had an interval under 5 hours before", the answer is in Marler's _Inventory_. to wit [emphasis mine]:</DIV> <DIV> </DIV> <DIV> <P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt; mso-bidi-font-family: 'Times New Roman'"><o:p></o:p></SPAN></P> <P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt; mso-bidi-font-family: 'Times New Roman'">"As a result of the 1959 earthquake Riverside's average interval was shortened about one hour.<SPAN style="mso-spacerun: yes">  </SPAN><STRONG>For the first few days following the August 17 incident the intervals were near 5 hours</STRONG>, following which they began to gradually lengthen.<SPAN style="mso-spacerun: yes">  </SPAN>By late 1959 the average had increased to 6 hours and 20 minutes.<SPAN style="mso-spacerun: yes">  </SPAN>During the 1960 season the average interval was 6 hours and 36 minutes.<SPAN style="mso-spacerun: yes">  </SPAN>During the following three seasons the average was about 7 hours and 10 minutes; shortening close to an hour during 1964.<SPAN style="mso-spacerun: yes">  </SPAN>Including the 1964 season, and to the end of 1969, the average was near 6 hours and 20 minutes.<SPAN style="mso-spacerun: yes">  </SPAN>The 1969 average, 6 hours and 14 minutes, was the shortest seasonal average on record."</SPAN></P> <P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt; mso-bidi-font-family: 'Times New Roman'"></SPAN> </P> <P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt; mso-bidi-font-family: 'Times New Roman'">In reviewing both Marler and Whittlesey, I see no indication that such short interval are known at any other time.</SPAN></P> <P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt; mso-bidi-font-family: 'Times New Roman'"></SPAN> </P> <P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt; mso-bidi-font-family: 'Times New Roman'">Scott Bryan<o:p></o:p></SPAN></P></DIV> <DIV> </DIV> <DIV> <DIV>In a message dated 6/14/2010 5:04:13 P.M. US Mountain Standard Time, goldbeml@ucmail.uc.edu writes:</DIV> <BLOCKQUOTE style="BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><FONT style="BACKGROUND-COLOR: transparent" color=#000000 size=2 face=Arial>According to the activity graphs posted on the GOSA website, the 5:14 <BR>interval was quite possibly the shortest one since May 2003.  The interval <BR>of 4:58 us the shortest since...<BR><BR>Has Riverside _ever_ had an interval under 5 hours before?<BR><BR>Michael Goldberg</FONT></BLOCKQUOTE></DIV></FONT></BODY></HTML>