摘要:

Experience with the Meinesz gravity‐apparatus on the gravity‐measuring cruise of the U.S. SubmarineS‐21during October and November 1928 led to the conclusion that gravity‐measurements might be made successfully upon surface vessels and especially upon sailing ships which would be free from engine vibrations. The survey‐vesselCarnegieof the Carnegie Institution of Washington, which had begun Cruise VII in May 1928, seemed to offer an ideal opportunity for experimental work which would test this conclusion, particularly in view of the fact that the vessel's program was one of scientific work ex

ISSN:0002-8606    

DOI:10.1029/TR010i001p00137

年代:1930

数据来源: WILEY

摘要:

By the phrasegravity‐anomalyis now meant the difference between the observed value ofgat a point on the Earth's surface and the theoretical value

ISSN:0002-8606    

DOI:10.1029/TR010i001p00140

年代:1930

数据来源: WILEY

摘要:

Various experiments have been made at various times and places for detecting the theoretical tide in the Earth's crust caused by the gravitation‐action of the moon. The most successful of these, perhaps, has been the Michelson‐Gale experiment at the Yerkes Observatory, Williams Bay, Wisconsin. Here the tilt‐method was employed, and the water tides observed in a pipe 500 feet long gave substantially the results predicted on the presumption of a solid Earth of coefficient of rigidit

ISSN:0002-8606    

DOI:10.1029/TR010i001p00148

年代:1930

数据来源: WILEY

摘要:

In every branch of science there comes a time when a review of progress and an attempt to outline future plans for development are of equal importance to the work being done at the time. We have in my opinion reached such a time in seismology in the United States. There can be no difference of opinion in regard to the importance of the investigation of the central region of an earthquake to both the seismologist and to the engineer. Since earthquakes occur with relative infrequency, there is also need for simulating earthquakes in order to study earthquake‐effects on structures. The viewpoint of the seismologist and that of the engineer interested in earthquakes are not necessarily the same. While deploring the destruction, the seismologist finds the most destructive earthquake as well as one which occurred in a region where it can do no harm as of equal value in furnishing useful information about the transmission of earthquake‐waves and the condition of the interior of the Earth, while the engineer is interested in only the destructive earthquake and then mainly in the study of structures that have survived for the useful lessons that can be drawn from t

ISSN:0002-8606    

DOI:10.1029/TR010i001p00153

年代:1930

数据来源: WILEY

摘要:

In the leading European scientific weekly (Nature, Feb. 22, 1930, p. 292) we read that “the Riviera Earthquake (Feb. 23, 1887) was not one of great strength for only 640 persons were killed, while the area disturbed contained 219,000 square miles

ISSN:0002-8606    

DOI:10.1029/TR010i001p00157

年代:1930

数据来源: WILEY

摘要:

It is a well‐known fact that horizontal‐component seismometers are affected by changes in the inclination of the axis of rotation of the boom whether this change in inclination is caused by temperature‐changes of the instrument itself or by changes in level of the pier due to tilting of the ground, the building in which the instrument is located, or to other causes. In the case of instruments using galvanometric registration such as the Wenner or the Galitsin, this is not a serious problem as the galvanometer is practically unaffected by tilt. However, for those instruments in which direct registration is used, whether mechanical or photographic, the problem of slow tilt may become so serious as to result in partial or total loss of record from overlapping of the lines on the seismogram or from excessive spreading. This is a real problem at the Coast and Geodetic Survey station at Chicago where it is necessary to make two adjustments of the light‐spots daily in order to keep the record within the limits of the drum. At Honolulu the trouble was partly eliminated by alteration of the direction of translation of the recordi

ISSN:0002-8606    

DOI:10.1029/TR010i001p00159

年代:1930

数据来源: WILEY

摘要:

Ten years ago, it is easily within the memory of all of us, there was very little activity in seismology in this country. I think it fair to say that of coordinated interest or of systematic research there was substantially none within the United States. Some very well‐equipped individual stations were maintained in different parts of the country by the Jesuit group for purposes of record and those were, I think, the only competent ones in regular operation in this country at that time. Each one of these stations was separately maintained and quite independent of the others both administratively and scientifically and even the reports of that time did not employ a common terminology. The Jesuit Seismological Association, which provided an effective organisation of these stations into a well‐coordinated group with a strong common purpose and a research‐program, is of later

ISSN:0002-8606    

DOI:10.1029/TR010i001p00161

年代:1930

数据来源: WILEY

摘要:

These two communications by Dr. Keith gave preliminary accounts of the two earthquakes; the final papers will be published in the American Journal of Science.

ISSN:0002-8606    

DOI:10.1029/TR010i001p00166-2

年代:1930

数据来源: WILEY

摘要:

This statement represents my personal views on this question, without any attempt to coordinate them with others or to ascertain the consensus of opinion concerning which differences of view are sure to prevail.To understand the question it is necessary to understand the nature of the two organizations. It is assumed quite unnecessary to discuss the nature or organization of the International Geodetic and Geophysical Union, with its sections, especially that of Meteorology. On the other hand, the International Meteorological Organization is not so well known, except among meteorologists, even though it has been in more or less complete existence for more than 50 years. Moreover, its activities have been marked by an unusual degree of harmony and cooperation in the field of meteorology. Therefore, it commands our reverence and respect.

ISSN:0002-8606    

DOI:10.1029/TR010i001p00167

年代:1930

数据来源: WILEY

摘要:

Progress in many branches of geophysical research involves the critical statistical analysis of great masses of homogeneous data like those of meteorology, solar physics, vital, health, and other statistics which for the purpose mist be assembled in appropriate time units of days, weeks, months, seasons, years, etc. It is surprising that many investigators who are meticulous about many details will nevertheless complacently tolerate the inherent inaccuracies caused by the use of the present calendar with its unequal months and the fractional relationships of such subunits as weeks and months, or decades with months or years, etc.

ISSN:0002-8606    

DOI:10.1029/TR010i001p00169

年代:1930

数据来源: WILEY