5/28/2023 0 Comments Box shot 3d v2.9.4 vn zoom![]() ![]() (Bottom images) Plumes of ash and gas drifting NW from Pico Central were observed on 9 November at 0652 (left image) and 0653 (right image). The darker peak centered in the foreground is Pico Sur, while the active Pico Central is located higher and to the right of that peak in these images. INGEOMINAS suggested this incandescence resulted from dome collapse events exposing hot rock. (Top images) Incandescence on 6 November was absent at 0331 (left image) but appeared at 0333 within the green circled region (right image). Note that these images have been altered from the originals GVP staff increased the brightness and contrast in order to better distinguish the peaks of the Huila complex. Accelerated dome growth was noted by INGEOMINAS that month (discussed in text below), and they annotated this image to circle the location of incandescence and summit activity. ![]() ![]() On 6 and 9 November 2009, summit activity from Nevado del Huila was observed by INGEOMINAS' N-looking Tafxnú web-camera. In 2009, plumes (frequently ash-and-gas, but in some cases gas without ash) rose to maximum heights above the dome as follows: 1,000-2,000 m in June 1,000-2,500 m in November and 2,000-5,000 m in December.įigure 26. From December 2008 to December 2009, the Tafxnú web-camera (located ~15 km S of the volcanic edifice) frequently recorded gas-and-ash plumes rising higher than 2,000 m above the active dome (figure 26). The local monitoring network was expanded during this reporting period, adding two infrasound monitoring stations in 20, two webcameras in 20, and instrumentation at the Caloto site that included a broadband seismometer and an electronic tilt station in 2012. The following subsections review webcamera and aerial observations, thermal-camera imaging, satellite images of volcanic plumes, seismicity, SO 2 measurements (DOAS, Flyspec, and OMI), acoustic flow monitoring, and new tilt data. In this report, we focus on the time period of December 2008-December 2012 and also discuss monitoring efforts overseen by INGEOMINAS with collaborators such as the Colombian Air Force (FAC), the Washington VAAC, and the Sulfur Dioxide Group's Ozone Monitoring Instrument (OMI). Activity generally decreased in November 2010 through 2012. From January 2009 to December 2012, the Instituto Colombiano de Geología y Minería (INGEOMINAS) reported persistent emissions from the lava dome and dramatic changes to the perched glacier as the lava dome expanded across the E and W flanks. Ash plumes were frequently observed by webcameras during late 2008 to December 2009, and satellite imagery reviewed by the Washington Volcanic Ash Advisory Center (VAAC) detected intermittent ash emissions between October 2009 and April 2011. Extrusion continued between November 2008 and November 2009. Lava dome emplacement occurred at Nevado del Huila's Pico Central (central peak) in late 2008, and was accompanied by seismic unrest and significant sulfur dioxide (SO 2) emissions ( BGVN 37:10). Dome growth and displaced glacier in 2009 decreasing activity during 2010-2012 ![]()
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