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Analog-to-digital conversion as a source of drifts in displacements derived from digital recordings of ground acceleration


, : Analog-to-digital conversion as a source of drifts in displacements derived from digital recordings of ground acceleration. Bulletin of the Seismological Society of America 93(5): 2017-2024

Displacements obtained from double integration of digitally recorded ground accelerations often show drifts much larger than those expected for the true ground displacements. These drifts might be due to many things, including dynamic elastic ground tilt, inelastic ground deformation, hysteresis in the instruments, and cross feed due to misalignment of nominally orthogonal sensors. This article shows that even if those effects were not present, the analog-to-digital conversion (ADC) process can produce apparent "pulses" and offsets in the acceleration baseline if the ground motion is slowly varying compared with the quantization level of the digitization. Such slowly varying signals can be produced by constant offsets that do not coincide with a quantization level and by near- and intermediate-field terms in the wave field radiated from earthquakes. Double integration of these apparent pulses and offsets leads to drifts in the displacements similar to those found in processing real recordings. These effects decrease in importance as the resolution of the ADC process increases.

US$19.90

DOI: 10.1785/0120020239


Other references

Kondratovich, M.A.; Ursulenko, V.I., 1978: The effect of intra aortic balloon counter pulsation on regional blood circulation. The effect of intra-aortic balloon counterpulsation (IABC) on the blood flow volume in the descending branch of the left coronary artery and in the vertebral, renal and femoral arteries was studied in dog experiments by means of an electromagnetic...

Lopatkin, N.A.; Martov, A.G.; Kamalov, A.A.; Gushchin, B.L., 1994: Pneumatic contact lithotripsy. The safety and clinical efficacy of electrohydraulic, ultrasonic and pneumatic lithotriptors were compared in experiments on dog ureters and plaster plates. Electrohydraulic and pneumatic were most effective contact lithotriptors. The safest of th...

Plotnikov I.A.; Usenko S.F., 1971: Evolution of the Mesozoic Mongol-Okhotsk fold-block systems of the Priamurye. Pages 111-114 1971

Mulay, S.R.; Thomasova, D.; Ryu, M.; Kulkarni, O.P.; Migliorini, A.; Bruns, H.; Gröbmayr, R.; Lazzeri, E.; Lasagni, L.; Liapis, H.; Romagnani, P.; Anders, H-Joachim., 2013: Podocyte loss involves MDM2-driven mitotic catastrophe. Podocyte apoptosis as a pathway of podocyte loss is often suspected but rarely detected. To study podocyte apoptosis versus inflammatory forms of podocyte death in vivo, we targeted murine double minute (MDM)-2 for three reasons. First, MDM2 inhib...

Tkaczuk, C., 1997: Pear leaf blister mite and pear rust mite - less known pear pests. Eriophyes piri and Epitrimerus piri are reported from pear in Poland.

Pan, L.; Sander, M.B.; Huang, X.; Li, J.; Smith, M.; Bittner, E.; Bockrath, B.; Johnson, J.Karl., 2004: Microporous metal organic materials: promising candidates as sorbents for hydrogen storage. Advancement in hydrogen storage techniques represents one of the most important areas of today's materials research. While extensive efforts have been made to the existing techniques, there is no viable storage technology capable of meeting t...

Reigstad A., 1982: Functional improvement following total hip replacement. Hip function in 130 consecutive total hip arthroplasties was tested preoperatively and 1 yr postoperatively with Charnley's modification of Merle d'Aubigne's numerical grading system for pain, walking ability and range of hip motion...

Halamandaris, M.P., 1983: The Visiting Nurse Association of Washington, D.C. Caring 26-28

Richelsen, Børn., 2012: Occurrence of obesity: stagnation of the increase. Ugeskrift for Laeger 174(17): 1141-1141

Broadley, D.G., 1959: Snakes of Southern Rhodesia. 9. The Purple-glossed snake (Galamelaps unicolor miolepis Gunther). African Wild Life, 13: 201-203