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Tidal triggering evidence of intermediate depth earthquakes in the Vrancea zone (Romania)
In: Natural hazards and earth system sciences: NHESS, Band 7, Heft 6, S. 733-740
ISSN: 1684-9981
Abstract. Tidal triggering evidence of intermediate earthquakes in the Vrancea region (Romania) is investigated. The Vrancea seismic zone is located in the bend region of the South-Eastern Carpathians (45°–46° N, 25.5°–27.5° E) and is known as one of the most active seismic zones in Europe. We selected earthquakes occurred between 1981 and 2005 from the RomPlus catalog provided by the Institute of Earth Physics of Bucharest with Mω≥2.5 and focal depths between 60 and 300 Km. We assigned a tidal component phase angle for each event which is computed from the earthquake occurrence time. Then the phase angle distribution was obtained by stacking every angle value in a 360 degree coordinate. Main lunar and solar semidiurnal tidal components M2 and S2 are considered. The phase angle distributions are tested by Permutation test which are introduced for the first time to a tidal triggering study. We compared results with classical Schuster's test. Both tests produce one value, pp for Permutation test and ps for Schuster's test, which represent the significance level for rejecting the null hypothesis that earthquakes occur randomly irrespective of tidal activities M2 and S2 phase distribution are random for the complete data set. However, when we set up a one year window and slide it by 30 d step, significant correlations were found in some windows. As a result of the sliding window, data set systematic temporal patterns related to the decrease of the pp and ps values seem to precede the occurrence of larger earthquakes.
Treatment of waste printed circuit board by green solvent using ionic liquid
In: Waste management: international journal of integrated waste management, science and technology, Band 32, Heft 10, S. 1914-1918
ISSN: 1879-2456
Very Weak Signals (VWS) detected by stacking method according to different astronomical periodicities (HiCum)
In: Natural hazards and earth system sciences: NHESS, Band 7, Heft 6, S. 651-656
ISSN: 1684-9981
Abstract. A stacking method to detect very weak signals is introduced in this paper. This method is to stack observed data in different well known periodicities according to the astronomical clock since majority geophysical observations are time based. We validated this method by applying it in four different cases. Interactions behind the observed parameters become obviously after it is stacked in two diurnal and semidiurnal tidal periodical waves. Amplitude and phase variations will be also measurable when a sliding windows stacking is used. This could be an important reference to find precursors before some earthquakes and volcanic events, corresponding to attenuations of medium patterns.
The separation of waste printed circuit board by dissolving bromine epoxy resin using organic solvent
In: Waste management: international journal of integrated waste management, science and technology, Band 33, Heft 2, S. 484-488
ISSN: 1879-2456
Long-Term Effects of Fertilization on Soil Organic Carbon Changes in Continuous Corn of Northeast China: RothC Model Simulations
In: Environmental management: an international journal for decision makers, scientists, and environmental auditors, Band 32, Heft 4, S. 459-465
ISSN: 1432-1009
Toughening mechanisms in V-Si-N coatings
In: Materials and design, Band 209, S. 109961
ISSN: 1873-4197