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We examine the association between earthquakes and Pc1 pulsationsobserved at a low-latitude station in Parkfield, California.  Theperiod under examination is ~7.5 years in total, from February1999 to July 2006, and we use an automatic identification algorithmto extract information on Pc1 pulsations from the magnetometer data.These pulsations are then statistically correlated to earthquakesfrom the USGS NEIC catalog within a radius of 200 km around themagnetometer, and <I>M</I>>3.0.  Results indicate that there is anenhanced occurrence probability of Pc1 pulsations ~5–15 daysin advance of the earthquakes, during the daytime. We quantify thestatistical significance and show that such an enhancement isunlikely to have occurred due to chance alone. We then examine theeffect of declustering our earthquake catalog, and show that eventhough significance decreases, there is still a statisticallysignificant daytime enhancement prior to the earthquakes.  Finally,we select only daytime Pc1 pulsations as the fiducial time of ouranalysis, and show that earthquakes are ~3–5 times more likelyto occur in the week following these pulsations, than normal.Comparing these results to other events, it is preliminarily shownthat the normal earthquake probability is unaffected by geomagneticactivity, or a random event sequence

The possible statistical relation of Pc1 pulsations to Earthquake occurrence at low latitudes