VOLCAN DE COLIMA, MEXICO DEFORMATION ANALYSYS OF RECENT DOME EXTRUSION 2009-2014 USING TILT METER SURVEYS CONFRONTED WITH DEFORMATIONS REGISTERED DURING PERIOD 1998-2007

Abstract:

Volcán de Colima, Mexico is considered one of the most active Volcano in Mexico and it is located between the states of Colima and Jalisco in the Central West part of the Country. During the period of 2009-2014 occurred one extrusion inside the dome that was growth in 2007 originating deformations that will be analysed and compared with deformations measured before during the period of 1998-2007. Four dome extrusions have occurred during the recent activity stage from 1998-2014. During period of domes growth we show deformation of the Volcano edifice with sequences of inflation- deflation registered with a Tiltmeter net composed of 5 sensors deployed around the edifice. Measurements of deformation tilt changes during the period 2004-2014 at Volcán de Colima were characterized by a sequence of effusive-explosive episodes. These sequences occurred on October 2004, February 2007 and January 2014 were registered by sequences of inflation-deflation principally. The tiltmeter net used in this study is composed of 5 sensors installed around the volcano edifice at altitudes of 3060 masl (COIA), 3200 masl (PCJ1), 2590 masl (PC02), 2200 masl (EHJ1) and 2070 masl (PC01). The activity of Volcán de Colima during this period 1998-2014 can be summarized by the occurrence of four lava domes formed in November 1998, October 2004, February 2007, and January 2014. During this activity phase explosive sequences occurred in years 2005, 2012 and 2014. After the extrusion on February 2007 a deflation phase is registered with the tilt sensors until 2012 which explain the low activity that characterize the behavior of the volcano during these periods of time. Here we show the analysis of the activity during the 2009-2014 and compare the deformations surveys during these period with the occurred during the complete recent period of activity 1998-2014. This comparison is important to forecast the developing of the activity and help to prevent the volcanic Risk of the Population located around the volcanic edifice.