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Sketch map of Lassen Volcanic National Park. Published & Donor: Arthur L. Day & E.T. Allen -"Volcano Activity & Hot Springs of Lassen Peak", pg. 55, 1925. 55. (...)pine trees were only charred at their outer extremities, the fire being insufficient even to burn up all of the exposed dead foliage (fig. 30). Of course, the effect of such a hot blast depends upon two factors, the temperature and the time of exposure. If the time of exposure were extremely short the temperature might be very high and still cause no fire. On the other hand, and exposure of 2 or 3 minutes to a much lower temperature might kindle such vegetation immediately. In a crude laboratory test it appeared that about 160 degrees C. for one minute would blast pine foliage in the same manner as the foliage was blasted along the boundaries of Lost Creek, but a higher temperature (and a shorter time of exposure) may have prevailed during the period of destruction there and still fall far short of the temperatures appropreate to red heat in the crater (600 degrees minimum). It also happened that the portion of the devastated zone nearest to (...) Fig. 29 - April 28, 1922. Sketch Map showing a portion of Lassen Volcanic National Park. Devastated area shown in black. 2 miles = 1 inch (approximately). (Courtesy of Mr. M. E. Dittman, Secretary, Lassen Volcanic National Park Association.) Hillary
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