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141.
Geophysical well-logs often show a complex behavior which seems to suggest a multifractal nature. Multifractals are highly intermittent signals, with distinct active bursts and passive regions which cannot be satisfactorily characterized in terms of just second-order statistics. They need a higher-order statistical analysis. In contrast with monofractals which have a homogeneous scaling, multifractals may include singularities of many types. Here we describe how a multiscale analysis can be used to describe the magnetic susceptibility data scaling properties for a deep well (KTB, Germany), down to about 9000 m. A multiscale analysis describes the local and global singular behavior of measures or distributions in a statistical fashion. The global analysis allows the estimation of the global repartition of the various Holder exponents. As such, it leads to the definition of a spectrum, D(), called the singularity spectrum. The local analysis is related to the possibility of estimating the Lipschitz regularity locally, i.e., at each point of the support of a multifractal signal. The application of both approaches to the KTB magnetic susceptibility data shows a meaningful correlation between the sequence of Holder exponents vs. depth and the lithological units. The Holder exponents reach the highest values for gneiss units, intermediate ones for amphibolite units and the lowest values for variegated units. Faults are found to correspond to changes for H also when they are of intra-lithological type. 相似文献
142.
A geological-geophysical expedition (Ev-K2–CNR 1988) visited the area from West Kun Lun to Karakorum (K2–Gasherbrum). Seven tectonic units including sedimentary, magmatic and metamorphic rocks were distinguished in this area; the northernmost are suggested to belong to the Kun Lun and Qiangtang Microplates. The sedimentary sequence of Shaksgam is proved to extend from the Permian to the Jurassic, with Carboniferous and Cretaceous ages more doubtful. This sequence shows intermediate affinities between the Karakorum and the Qiangtang. The two southernmost units belong to the Karakorum Microplate. The Karakorum Fault Zone comprises a complex pattern of faults and thrusts, with brittle deformation and uplifting of granitoid bodies. 相似文献
143.
We present a method for calibrating every instrument working with magneto-optical filter (MOF) technology, in order to take
into account the effect in the observations due to the aging of the vapour cells. The method allows the evaluation of some
characteristics of the transmission profile by modelling the blue and/or the red line intensity images acquired with the MOF
system. In particular, it reveals the presence of unwanted spurious transmissions and prevents cross-talk between the intensity
and velocity fluctuations. The method also gives information about the position of the “working point” of the instrument,
i.e. the average wavelength position of its transmission profile, which is necessary for estimating the right solar atmospheric
layer observed by the MOF. This analysis is powerful and fast: applied before every observing campaign, it enables setting
Q the most suitable value for the cell temperature, which is one of the parameters that controls the MOF transmission profile. 相似文献
144.
Strombolian explosive styles and source conditions: insights from thermal (FLIR) video 总被引:1,自引:3,他引:1
Matthew R. Patrick Andrew J. L. Harris Maurizio Ripepe Jonathan Dehn David A. Rothery Sonia Calvari 《Bulletin of Volcanology》2007,69(7):769-784
Forward Looking Infrared Radiometer (FLIR) cameras offer a unique view of explosive volcanism by providing an image of calibrated
temperatures. In this study, 344 eruptive events at Stromboli volcano, Italy, were imaged in 2001–2004 with a FLIR camera
operating at up to 30 Hz. The FLIR was effective at revealing both ash plumes and coarse ballistic scoria, and a wide range
of eruption styles was recorded. Eruptions at Stromboli can generally be classified into two groups: Type 1 eruptions, which
are dominated by coarse ballistic particles, and Type 2 eruptions, which consist of an optically-thick, ash-rich plume, with
(Type 2a) or without (Type 2b) large numbers of ballistic particles. Furthermore, Type 2a plumes exhibited gas thrust velocities
(>15 m s−1) while Type 2b plumes were limited to buoyant velocities (<15 m s−1) above the crater rim. A given vent would normally maintain a particular gross eruption style (Type 1 vs. 2) for days to
weeks, indicating stability of the uppermost conduit on these timescales. Velocities at the crater rim had a range of 3–101 m
s−1, with an overall mean value of 24 m s−1. Mean crater rim velocities by eruption style were: Type 1 = 34 m s−1, Type 2a = 31 m s−1, Type 2b = 7 m s−1. Eruption durations had a range of 6–41 s, with a mean of 15 s, similar among eruption styles. The ash in Type 2 eruptions
originates from either backfilled material (crater wall slumping or ejecta rollback) or rheological changes in the uppermost
magma column. Type 2a and 2b behaviors are shown to be a function of the overpressure of the bursting slug. In general, our
imaging data support a broadening of the current paradigm for strombolian behavior, incorporating an uppermost conduit that
can be more variable than is commonly considered. 相似文献
145.
Andrew Harris Jon Dehn Matt Patrick Sonia Calvari Maurizio Ripepe Luigi Lodato 《Bulletin of Volcanology》2005,68(2):107-117
A safe, easy and rapid method to calculate lava effusion rates using hand-held thermal image data was developed during June 2003 at Stromboli Volcano (Italy). We used a Forward Looking Infrared Radiometer (FLIR) to obtain images of the active lava flow field on a daily basis between May 31 and June 16, 2003. During this time the flow field geometry and size (where flows typically a few hundred meters long were emplaced on a steep slope) meant that near-vertical images of the whole flow field could be captured in a single image obtained from a helicopter hovering, at an altitude of 750 m and ∼1 km off shore. We used these images to adapt a thermally based effusion rate method, previously applied to low and high spatial resolution satellite data, to allow automated extraction of effusion rates from the hand-held thermal infrared imagery. A comparison between a thermally-derived (0.23–0.87 m3 s−1) and dimensionally-derived effusion rate (0.56 m3 s−1) showed that the thermally-derived range was centered on the expected value. Over the measurement period, the mean effusion rate was 0.38±0.25 m3 s−1, which is similar to that obtained during the 1985–86 effusive eruption and the time-averaged supply rate calculated for normal (non-effusive) Strombolian activity. A short effusive pulse, reaching a peak of ∼1.2 m3 s−1, was recorded on June 3, 2003. One explanation of such a peak would be an increase in driving pressure due to an increase in the height of the magma contained in the central column. We estimate that this pulse would require the magma column to attain a height of ∼190 m above the effusive vent, which is approximately the elevation difference between the vent and the floor of the NE crater. Our approach gives an easy-to-apply method that has the potential to provide effusion rate time series with a high temporal resolution.Editorial responsibility: M. Carroll 相似文献
146.
Maurizio Maugeri Letizia Buffoni Barbara Delmonte Adriana Fassina 《Climatic change》2002,53(1-3):119-149
Daily meteorological observations have been made at the Brera astronomical observatory in Milan since 1763. Even if the data have always been collected at this observatory, the Milan series are far from being homogeneous as several changes were made to instruments, station location and observation methods. Within this context, the purpose of the paper is to discuss data homogenisation. Homogenisation is based both on objective information extracted from the station history (direct methodology) and on some statistical estimates (indirect methodology). Homogenisation by indirect methodology is mainly performed by comparison with other series whereas, if no other homogeneous series are available, it is based on the hypothesis that some statistics, such as the daily temperature range or the day to day variability, have no significant trends within some selected periods. Besides homogenisation also the completion of the series is discussed. Theresulting series are complete and homogenised daily minimum, mean and maximum temperatures and complete and homogenised daily mean pressures. They all cover the period 1763–1998. 相似文献
147.
The edge dislocation problem in a layered elastic medium 总被引:2,自引:0,他引:2
Eleonora Rivalta Walter Mangiavillano Maurizio Bonafede 《Geophysical Journal International》2002,149(2):508-523
148.
On strike-slip faulting in layered media 总被引:2,自引:0,他引:2
Maurizio Bonafede Beatrice Parenti Eleonora Rivalta 《Geophysical Journal International》2002,149(3):698-723
149.
Maurizio Gaetani Lucia Angiolini Alda Nicora Dario Sciunnach Patrick Le Fort Seifnullah Tanoli Asif Khan 《International Journal of Earth Sciences》1996,85(4):683-704
During the summer of 1992 a geological expedition crossed the northern Karakorum range in northern Pakistan, from the Chitral
to Karambar valleys, from the villages of Mastuj to Imit. Some of the areas visited were geologically unknown. A number of
structural units were crossed, belonging to the Karakorum block or to other crustal blocks north of it. They are: (a) the
axial batholith, in which three plutonic bodies have been identified, and (b) the northern sedimentary belt (NSB), in which
three major tectonostratigraphic units form thrust stacks dipping to the north. Their internal stratigraphy and structural
style are partly different. The most complete contains a crystalline basement, transgressed by a marine succession during
the Early Ordovician. The youngest strata are represented by the Reshun conglomerate, of inferred Cretaceous age. The northernmost
unit of the NSB is tightly folded, whereas the central one forms a monocline. Vertical faults, mainly strike-slip, dissect
the thrusted slabs. Metamorphic deformation is absent or reaches only the anchizone in the studied sector of the Karakorum
NSB. To the north of the Karakorum proper there are several other tectonic units, separated by vertical faults. They are,
from south to north: (a) the Taš Kupruk zone, with metavolcanics of basaltic to latibasaltic composition; (b) the Atark unit,
mostly consisting of massive carbonate rocks of Mesozoic age; and (c) the Wakhan slates which consist of a thick widespread
succession of dark slates, metasiltites and sandstones. The fine-grained elastic rocks are supposed to be Palaeozoic to Early
Triassic in age. The Wakhan slates are intruded by plutons belonging to the East Hindu Kush batholith, from which a single
K/Ar age on muscovite gave a Jurassic age. 相似文献
150.