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  • 1
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    Investigating possible gravity change rates expected from long-term deep crustal processes in Taiwan (2014)
    Oxford University Press
    Details
    Publication Date: 2014-06-21
    Description: We propose to test if gravimetry can prove useful in discriminating different models of long-term deep crustal processes in the case of the Taiwan mountain belt. We discuss two existing tectonic models that differ in the deep processes proposed to sustain the long-term growth of the orogen. One model assumes underplating of the uppermost Eurasian crust with subduction of the deeper part of the crust into the mantle. The other one suggests the accretion of the whole Eurasian crust above crustal-scale ramps, the lower crust being accreted into the collisional orogen. We compute the temporal gravity changes caused only by long-term rock mass transfers at depth for each of them. We show that the underplating model implies a rate of gravity change of –6 x 10 –2 μGal yr –1 , a value that increases to 2 x 10 –2 μGal yr –1 if crustal subduction is neglected. If the accretion of the whole Eurasian crust occurs, a rate of 7 x 10 –2 μGal yr –1 is obtained. The two models tested differ both in signal amplitude and spatial distribution. The yearly gravity changes expected by long-term deep crustal mass processes in Taiwan are two orders of magnitude below the present-day uncertainty of land-based gravity measurements. Assuming that these annually averaged long-term gravity changes will linearly accumulate with ongoing mountain building, multidecadal time-series are needed to identify comparable rates of gravity change. However, as gravity is sensitive to any mass redistribution, effects of short-term processes such as seismicity and surface mass transfers (erosion, sedimentation, ground-water) may prevent from detecting any long-term deep signal. This study indicates that temporal gravity is not appropriate for deciphering the long-term deep crustal processes involved in the Taiwan mountain belt.
    Keywords: Gravity, Geodesy and Tides
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Deutsche Geophysikalische Gesellschaft (DGG) and the Royal Astronomical Society (RAS).
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  • 2
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    Seismic versus aseismic deformation in Iran inferred from earthquakes and geodetic data (2005)
    In:  Geophys. J. Int., Zagreb, Univ. Tokyo, vol. 160, no. 1, pp. 217-226, pp. L04601, (ISSN: 1340-4202)
    Details
    Publication Date: 2005
    Keywords: Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Seismicity ; Geodesy ; Global Positioning System, ; intracontinental ; deformation, ; seismicity, ; GJI ; Chery
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Active deformation in Zagros-Makran transition zone inferred from Global Positioning System measurements (2006)
    In:  Geophys. J. Int., Ottawa, Bundesanstalt für Geowissenschaften und Rohstoffe, vol. 165, no. 1, pp. 373-381, pp. 2371
    Details
    Publication Date: 2006
    Keywords: Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Tectonics ; Geodesy ; Iran ; Subduction zone ; GJI ; active ; deformation, ; collision, ; Subduction
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Tomographic evidence for localized lithospheric shear along the Altyn Tagh fault (1998)
    In:  Science, Hannover, Elsevier, vol. 282, no. 4, pp. 74-76, pp. L15S14, (ISSN: 1340-4202)
    Details
    Publication Date: 1998
    Keywords: Tomography ; China ; Rock mechanics ; Seismology
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    Transient Deformation in the Asal-Ghoubbet Rift (Djibouti) Since the 1978 Dyking Event : Is Deformation Controlled by Magma Supply Rates ? (2016)
    Wiley
    Details
    Publication Date: 2016-07-14
    Description: The Asal-Ghoubbet Rift (AG Rift) in Djibouti lies in the subaerial continuation of the Aden ridge system, thereby constituting a unique location to study rifting processes and mechanisms involved in continental break up and oceanic spreading. Continually upgraded and expanded geodetic technology has been used to record the 1978 Asal rifting event and post-diking deformation. In light of recent results obtained for the Manda Hararo–Dabbahu rifting event (2005–2010), we propose that the horizontal and vertical geodetic data can be modeled with a double source, involving a dyke-like inflation component aligned along the rift axis and a spherical pressure source located at mid-segment below the Fieale caldera. By revisiting the co-dyking data, we propose that the reservoir below Fieale could have fed, at least partially, the 1978 injection and the contemporaneous Ardoukôba eruption, and potentially induced local subsidence due to magma draining out of the central reservoir. As an alternative to previously proposed visco-elastic relaxation models, we re-interpret post-dyking observations using a purely elastic rheology. We determine the relative contribution of a mid-segment reservoir inflation and a dyke-like opening component, together with their respective time evolutions. Our results suggest that interactions between steadily accumulating tectonic strain and temporal variations in melt supply to the shallow magma plumbing system below the AG Rift may entirely explain the geodetic observations and that visco-elastic deformation processes played a minor role in the 30 years following the 1978 rifting event.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 6
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    Tomographic evidence for localized lithospheric shear along the altyn tagh fault (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-10-02
    Description: Seismic tomography across the Altyn Tagh fault, at the north edge of the Tibetan Plateau, reveals a low P-wave velocity anomaly below the fault down to 140 kilometers. This anomaly probably reflects strike-slip shear in the lithosphere. Slip-partitioning may also induce a wedge of crust from the Tarim Basin to plunge into the mantle.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wittlinger -- Tapponnier -- Poupinet -- Mei -- Danian -- Herquel -- Masson -- New York, N.Y. -- Science. 1998 Oct 2;282(5386):74-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉G. Wittlinger, G. Herquel, F. Masson, Institut de Physique du Globe de Strasbourg, Centre National de la Recherche Scientifique, Universite Louis Pasteur, 5 rue R. Descartes 67084 Strasbourg, France. P. Tapponnier, Laboratoire de Tectoniq.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9756478" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    Aseismic slip and seismogenic coupling in the Marmara Sea: What can we learn from onland Geodesy? (2017)
    Wiley
    Details
    Publication Date: 2017-03-23
    Description: Ever since the M w 7.4 Izmit earthquake in 1999, evaluation of seismic hazard associated with the last unbroken segments of the North Anatolian fault is capital. A strong controversy remains over whether Marmara fault segments are locked or are releasing strain aseismically. Using a Bayesian approach, we propose a preliminary probabilistic inter-seismic model constrained by published GPS data sets. The posterior mean model show that Ganos and Cinarcik segments are locked while creep is detected in the central portion of Marmara fault. Our analysis, however, reveal that creeping segments are associated with large model uncertainties, which mainly results from the sparsity of current geodetic observations. We then discuss how the GPS network can be improved to attain more reliable assessment of inter-seismic slip rates. With this purpose, we implement a network optimization procedure to identify the most favorable distribution of stations measuring strain accumulation in the Marmara Sea.
    Print ISSN: 0094-8276
    Electronic ISSN: 1944-8007
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 8
    Electronic Resource
    Electronic Resource
    Atrial natriuretic factor in patients with acromegaly (1990)
    Springer
    European journal of clinical pharmacology 38 (1990), S. 409-413 
    Details
    ISSN: 1432-1041
    Keywords: atrial natriuretic factor (ANF) ; acromegaly ; volume expansion ; plasma levels ; extracellular fluid volume ; saline load
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary In acromegaly the plasma volume is chronically elevated and it returns to normal when the disease is successfully treated. To define the role of ANF in such a chronic disorder of extracellular fluid volume homeostasis the plasma level was assayed in 37 acromegalic patients with active or inactive (successfully treated) disease. Five patients were studied before and after therapy. The effects of acute change in sodium-fluid status on plasma ANF levels was examined in 7 active and 4 inactive acromegalic patients and in 7 healthy subjects. As compared to 14 patients with inactive acromegaly, 23 patients with active acromegaly had an expanded plasma volume (n=12; 50.1 vs 37.6 ml · kg−1 BW) and an increased blood concentration of growth hormone (n=23; 22.5 vs 2.1 ng · ml−1). Plasma ANF concentrations in active and inactive acromegalic patients (33.2 and 26.6 pg · ml−1, respectively) did not differ significantly from one another or from the level in the controls (26.9 pg · ml−1). In those patients there was no correlation between plasma volume and ANF level. Infusion of 21 isotonic saline in 2 h led to a similar, significant increase in ANF levels in active (from 26.2 to 72.4 pg · ml−1) and in inactive acromegalic patients (from 33.6 to 96.7 pg · ml−1) as well as in healthy subjects (from 21 to 70.6 pg · ml−1). Successful treatment reduced the plasma volume (from 49.2 to 35.8 ml · kg−1 BW) and growth hormone level (from 10.1 to 2.6 pg · ml−1), while the ANF level remained unchanged (from 33.8 to 35.5 pg · ml−1). In the patients with active or inactive acromegaly and cardiac failure the plasma ANF level was markedly increased (89.9 and 66.1 pg · ml−1, respectively) as compared to all the other groups. It is concluded that ANF levels are not elevated in chronically volume expanded acromegalic patients. In the present patients ANF was released in response to acute volume expansion, therefore it may be important in the cardiovascular and renal response to acute changes in extracellular fluid volume.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02336675
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  • 9
    Electronic Resource
    Electronic Resource
    Atrial natriuretic peptide level and intracardiac pressure in cardiac transplant recipients (1990)
    Springer
    European journal of clinical pharmacology 38 (1990), S. 219-221 
    Details
    ISSN: 1432-1041
    Keywords: Atrial natriuretic peptide ; Cardiac transplant recipients ; Intra cardiac pressures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Blood pressures and plasma atrial natriuretic peptide (ANP) concentrations have been measured in venous and intracardiac sites in 11 patients (10 men and 1 woman) given cardiac transplants. The mean plasma ANP level was 214.4 pg·ml−1 in the superior veina cava and 281 pg·ml−1 in the right atrium. This significantly higher level was maintained in the right ventricle (269) and in the pulmonary artery (295). The level in controls was 25 pg·ml−1. Intra cardiac and mean arterial pressures were in normal range in all patients, and there was no correlation between plasma ANP level and intracardiac pressure. The data suggest that in cardiac transplant patients right atrial pressure does not have a primary role in releasing ANP. The transplanted heart is denervated and remains so for many months after operation, thus suggesting that innervation is not obligatory for ANP secretion. Further studies are required to determine the relative contribution of donor and recipient atrial tissues to ANP secretion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315019
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  • 10
    Electronic Resource
    Electronic Resource
    Cicletanine does not affect plasma atrial natriuretic peptide concentration in healthy subjects (1990)
    Springer
    European journal of clinical pharmacology 39 (1990), S. 593-594 
    Details
    ISSN: 1432-1041
    Keywords: Cicletanine ; (ANP) atrial natriuretic peptide ; plasma cyclic GMP ; antidiuretic hormone ; exercise
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The effect of 50 and 150 mg cicletanine, a new vasodilator antihypertensive, on plasma atrial natriuretic peptide (ANP), cyclic GMP and antidiuretic hormone has been investigated at rest and during standardized exercise, in a double blind cross over study in healthy subjects. Exercise significantly increased the plasma ANP, cyclic GMP and antidiuretic hormone concentrations, and cicletanine did not affect any of them either at rest or during exercise. Since the alpha-1 adrenoceptor blocker prazosine decreases, beta-adrenoceptor blockers increase and the vasodilator cicletanine does not alter the plasma ANP response to exercise, it is suggested that adrenergic receptors may be directly involved in the regulation of ANP secretion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00316103
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