Concurrent storms of long and ultralong period microseisms

1963 ◽  
Vol 53 (1) ◽  
pp. 15-26 ◽  
Author(s):  
Jack Oliver ◽  
Robert Page
Keyword(s):  
New York ◽  
Particle Motion ◽  
Spectral Analyses ◽  
Long Period ◽  
Northeastern Pacific ◽  
Motion Studies

Abstract Storms of ultralong period (14-18 seconds) microseisms are shown to be concurrent with storms of the more familiar long period (7-9 seconds) microseisms, and to be related to the same meteorological disturbances. Data from Palisades, New York, were analyzed for two cases, one for a meteorological storm over the northeastern Pacific and one for a meteorological storm in the northwestern Atlantic. The conclusions are based on correlation of continuous spectral analyses of the concurrent microseism storms, and on ground particle motion studies. The periods of the ultralong period microseisms at any given time are, within the precision of the measurements, twice the periods of the long period microseisms at that time.

Nonintrusive Particle Motion Studies in the Near-Wall Region of a Pilot-Scale Circulating Fluidized Bed

2004 ◽  
Vol 43 (18) ◽  
pp. 5582-5592 ◽  
Author(s):  
Preetanshu Pandey ◽  
Richard Turton ◽  
Paul Yue ◽  
Lawrence Shadle
Keyword(s):  
Fluidized Bed ◽  
Particle Motion ◽  
Circulating Fluidized Bed ◽  
Pilot Scale ◽  
Wall Region ◽  
Motion Studies ◽  
Near Wall

Free spheroidal vibrations of the earth at very long periods, Part II— effect of rigidity of the inner core

1963 ◽  
Vol 53 (3) ◽  
pp. 503-515
Author(s):  
Leonard E. Alsop
Keyword(s):  
Particle Motion ◽  
Inner Core ◽  
Shear Velocity ◽  
Free Vibrations ◽  
Numerical Calculations ◽  
Core Mode ◽  
Long Period ◽  
The Earth ◽  
Many Core ◽  
Core Modes

Abstract Numerical calculations have been made on an IBM 7090 of the periods and particle motion with depth of the lowest order free spheroidal vibrations of the fundamental and first two higher modes with inner core shear velocity as a parameter. All calculations were made for a model with velocities according to Jeffreys and with densities obeying Bullen's model B. These calculations show that the effect of the inner core shear velocity on these periods is slight, except for those velocities at which the modes have periods near to the periods of core modes. This means that observations of long period free vibrations will probably not give much information about rigidity of the inner core. A mode of vibration having many of the properties of the mode suggested by Slichter has been discovered. In addition, it appears that the presence of a solid inner core brings into existence many core type modes with periods both shorter and longer than the original core mode predicted by Alterman, Jarosch, and Pekeris.

Source parameters of the June 13, 1967 earthquake near Lake Ontario, New York State

1977 ◽  
Vol 14 (11) ◽  
pp. 2651-2657 ◽  
Author(s):  
Michio Hashizume ◽  
Nagakoto Tange
Keyword(s):  
New York ◽  
Surface Wave ◽  
Epicentral Distance ◽  
Source Parameters ◽  
New York State ◽  
Focal Depth ◽  
Lake Ontario ◽  
Strike Slip ◽  
York State ◽  
Long Period

Source parameters of an earthquake with magnitude mb = 4.4 were determined by using surface waves. Small but clear surface wave signals were observed on long period records gathered from seismograph stations within an epicentral distance of about 2000 km. The focal mechanism was determined to be of strike-slip type with the maximum and the minimum compression axes trending NNW–SSE and ENE–WSW, respectively. The focal depth was determined to be near either 3 or 20 km.

scholarly journals On the origin of the long-period tremor recorded at Stromboli volcano (Italy)

1996 ◽  
Vol 39 (2) ◽  
Author(s):  
T. Braun ◽  
J. Neuberg ◽  
M. Ripepe
Keyword(s):  
Particle Motion ◽  
Plane Waves ◽  
Seismic Source ◽  
Stromboli Volcano ◽  
Volcanic Origin ◽  
Arrival Times ◽  
Long Period ◽  
Volcanic Source ◽  
Seismic Amplitudes ◽  
Primary Frequency

This investigation deals with the nature of the long-period seismic signals (>1 s) observed at Stromboli and addresses the question whether they are of volcanic origin or produced by sources such as Ocean Microseisms (OMS). We present results from the analysis of seismic broadband data recorded during 1992 by an array of 9 Guralp CMG-3T seismometers. The determination of the Array Response Function (ARF) shows that array techniques like delay-and-sum beamforming cannot be applied for this purpose, as the extension of the array is limited by the geographical constraint of the island of Stromboli volcano, being simply too small. Spectral analysis reveals three main peaks with periods at 4.8 s, 6 s and 10 s which are not stable in time but vary according to the regional meteorological situation. Whereas 4.8 s and 10 s show up in amplitude spectra calculated during rainy and stormy weather, the 6 s period can be observed during a period of good weather. The signals were first narrowly filtered and then cross correlation, particle motion and amplitudes of the main long periods studied in detail. Relative arrival times as well as seismic amplitudes of the filtered traces do not show any systematic feature but vary with time. Particle motion analysis demonstrates that all long-period signals are recorded by the array as plane waves and that the main propagation direction of the 10 s signal is parallel to the wind direction. No correlation with volcanic activity is obvious. We conclude therefore that the three main long periods are not generated by a close volcanic source. We assume a local cyclone to be the seismic source at 4.8 s and 10 s, which represent the Double Frequency (DF-band) and the Primary Frequency (PF-band), respectively. Concerning the 6 s peak, we speculate a cyclone near the British Isles to act as a seismic source.

A surface wave particle motion discrimination process

1968 ◽  
Vol 58 (2) ◽  
pp. 629-637
Author(s):  
R. S. Simons
Keyword(s):  
Surface Wave ◽  
Surface Waves ◽  
Particle Motion ◽  
Seismic Data ◽  
Digital Computer ◽  
Rayleigh Waves ◽  
Motion Pattern ◽  
Signal To Noise ◽  
Long Period ◽  
Period Data

Abstract A digital computer process is described which examines the three-componen particle-motion pattern of seismic data as a function of frequency and uses this information to discriminate against all motion except surface waves arriving from some pre-assigned direction. Application of the process to long-period data has shown that it can substantially improve the signal-to-noise ratios of Love and Rayleigh waves from earthquakes and underground detonations.

Don DeLillo and the Myth of the Author–Recluse

2000 ◽  
Vol 34 (1) ◽  
pp. 137-152
Author(s):  
JOE MORAN
Keyword(s):  
New York ◽  
Don Delillo ◽  
Common Theme ◽  
Long Period ◽  
Celebrity Culture ◽  
Major League ◽  
The Media ◽  
Automatic Mechanism ◽  
Specific Concern

The subtly entrapping nature of celebrity has been a common theme of Don DeLillo's work since his third novel, Great Jones Street (1973), narrated by a twenty-six-year-old rock star, Bucky Wunderlick, who tires of fame in the middle of a national tour and goes to ground in a seedy New York bedsitter. This theme, however, finds its fullest expression in DeLillo's 1991 novel Mao II, where it is linked to a specific concern which may be closer to home for him – the paradoxical fascination with author–recluses in American celebrity culture. DeLillo, who came to reluctant terms with major league celebrity from the mid-1980s onwards after a long period of respectful reviews and polite notices, has praised reclusive authors for “refusing to become part of the all-incorporating treadmill of consumption and disposal,” in spite of the “automatic mechanism” of the media which tries “to absorb certain such reluctant entities into the weave.” Mao II is about what happens when this absorption takes place, and whether or not this wholly devalues the author's own tactics of silence and renunciation.

Dementia due to Huntington's disease

2012 ◽  
pp. 371-375
Author(s):  
Susan Folstein ◽  
Russell L. Margolis
Keyword(s):  
New York ◽  
Huntington's Disease ◽  
Huntington’S Disease ◽  
Autosomal Dominant ◽  
Long Island ◽  
Record Keeping ◽  
Long Period ◽  
Medical Disorder ◽  
American Physician ◽  
Clear Description

Huntington's disease (HD) was first described in 1872 by an American physician living on Long Island, New York. His father and grandfather practised medicine in the same community, so he had access to case notes from several generations of families who lived there. This long period of record keeping allowed him to document a hereditary form of chorea, similar to ‘common (Sydenham's) chorea’, but progressing over many years to death. Its sufferers had a tendency to insanity and suicide. Huntington's brief essay, which also included a clear description of autosomal dominant inheritance, remains one of the classical descriptions of a medical disorder.

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