Abstract
WE have received the eighteenth annual volume (for 1930) of the seismological records of the Observatory of De Bilt in Holland. The observatory is provided with a pair of horizontal seismographs and a vertical seismograph of the Galitzin type, a Wiechert astatic horizontal seismograph, and a pair of Bosch horizontal pendulums. During the year 1930, 444 earthquakes were recorded at the station, in the great majority of which the position of the origin is known or estimated. In a paper recently published by the Seismological Society of America (Bulletin, vol. 22, pp. 263–269; 1932), Mr. J. A. Fleming describes the new seismological station at the Huan-cayo magnetic observatory in Peru, situated about 120 miles east of Lima in lat. 12° 2.7 S., long. 75° 20″4′ W., at a height of 11,000 ft. above the sea. The station is equipped with a pair of Wenner horizontal component seismometers and a Benioff vertical component seismometer. Regular observations with the three instruments were begun on August 22, 1932.
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