. After earthquake and fire . g thisline are very commonly found abrupt changes in the normalslope of the valley-sides giving rise to what are technicallyknown as scarps. These scarps have the appearance of lowprecipitous walls which have been usually softened androunded somewhat by the action of the weather. Small basinsor ponds, many having no outlet, and some containing salinewater, are of fairly frequent occurrence and they usually lieat the base of the small scarps. Trough-like depressions alsooccur bounded on both sides by scarps. These troughs andbasins can only be explained as due to a
. After earthquake and fire . g thisline are very commonly found abrupt changes in the normalslope of the valley-sides giving rise to what are technicallyknown as scarps. These scarps have the appearance of lowprecipitous walls which have been usually softened androunded somewhat by the action of the weather. Small basinsor ponds, many having no outlet, and some containing salinewater, are of fairly frequent occurrence and they usually lieat the base of the small scarps. Trough-like depressions alsooccur bounded on both sides by scarps. These troughs andbasins can only be explained as due to an actual subsidenceof the ground, or to an uplift of the ground on one side orthe other, or on both sides. The scarps similarly can onlybe ascribed to a rupture of the earth with a relative verticaldisplacement along the rupture plane. Frequently smallknolls or sharp little ridges are found to characterize thisline and these are bounded on one side by a softened scarpand separated from the normal slope of the valley-side by a. 150 AFTER EARTHQUAKE AND FIRE. line of depression. In many cases these features have beenso modified and toned down by atmospheric attack that onlythe expert eye can recognize their abnormal character; butwhere their line traverses the more desert parts of the CoastRange, as for example in the Carissa plains, they are wellknown to the people of the country and the aggregate of thefeatures is commonly referred to as the earthquake line begins on the north at the mouth of Alder creeknear Point Arena and extends southeasterly nearly parallelwith the coast line to a point about two miles below FortRoss, a distance of 43 miles. Here it passes outside of theshore line and is again met with at the point where BodegaHead joins the mainland. Thence it appears to continuesouthward through Tomales bay and Bolinas lagoon. BeyondBolinas lagoon it passes outside of the Golden Gate and entersthe shore again at Mussel Rock, eight miles south of theCliff House.
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Keywords: ., bookcentury1900, bookdecade1900, bookidafterearthqu, bookyear1906
