I906J1 MINUTES. 181 



In Buena Cove the mud has been found ninety feet deep ; in Mission Creek 

 ninety-six feet. The " filHng in " has been sand, the waste of the city, and 

 occasionally rock. To erect buildings thereon piling must' be driven to " hard 

 pan." In Mission Creek this has rarely been done ; and therefore we must 

 expect to find, and do find the greatest dislocation in such areas, and at the 

 contact with fast land. 



The towns of Redwood, Palo Alto, San Jose, etc., are built on the alluvial 

 soil immediately inside the marshland, and are probably twenty feet above 

 the bay. 



These places and others about the bay show large destruction of property. 



Up the Valleys of Petaluma and Napa similar results are presented. 



On the rocky parts of San Francisco the horizontal resultant movement 

 was three to four inches, on the " filled " in land near the new Post Office, 

 the building, piled upon a clay foundation, suffered but little, while the street 

 in front, made upon twenty-three feet of sand over a marsh, sank two feet 

 and slid out from the building about one and one-half feet. 



Area of Disturbance. — The Committee appointed by the Governor to 

 gather data is doing what it can to define the locus of principal action, and 

 the extent and direction of the lines of disturbance. 



In my early inquiries I learn of injury to the Light House at Point Arena, 

 latitude 39° 00', no miles from San Francisco, and at " landing places " on the 

 coast this way; damage fifty to sixty miles up the Petaluma and Napa Val- 

 leys; movement in the Yosemite Valley, 175 miles from San Francisco; 

 and damage at Carmel Bay south of Alonterey, ninety miles from San 

 Francisco. 



Up the Napa Valley material was thrown to the west-southwest; at 

 Yosemite motion east and west; at Carmel Bay material to east; at Carson, 

 Nevada, first movements nearly east and west, distance 180 miles to north- 

 east, ended in several tangles. 



At San Francisco movement from north to south, then east and west; 

 and a final series of reverberations too puzzling to decipher. I judged these 

 shocks to be about three or four per second. 



There are reports of crevices in the west slope of the hills north of 

 Berkeley; in the Canada de Raymundo, with depression on one side; and 

 on the outer coast at Half Moon Bay, twenty miles south of San Francisco; 

 and at Bolinas Bay ten miles north of the Golden Gate. But all are in alluvial 

 soil. 



Vessels at Sea. — The action upon vessels in the Gulf of the Farallones, 

 off the entrance to the Golden Gate, has been given me by Pilot Hayes. The 

 Pilot boat Gracey S. was lying in eighteen fathoms off the light ship, ten 

 miles from the Head of the entrance to the Golden Gate, and shivered as 

 if the chain were running through the hawse. When the pilot boarded the 

 German ship the captain told him he thought his vessel was on the rocks; 

 and a second pilot boat thought that she was upon the rocks. 



This striking and shivering of the ship has been felt many times off the 

 northwest of Cape Mendocino, or the prolongation of that range. 



