A5018796322- earthquake and tectonic studies
- Earthquake Detection and Analysis
- Seismic Waves and Analysis
- High-pressure geophysics and materials
- Seismology and Earthquake Studies
- Seismic Imaging and Inversion Techniques
- Geological and Geochemical Analysis
- Seismic Performance and Analysis
- Geochemistry and Geologic Mapping
- Geomagnetism and Paleomagnetism Studies
- Statistical and numerical algorithms
- Landslides and related hazards
- Geology and Paleoclimatology Research
- Complex Systems and Time Series Analysis
- Maritime and Coastal Archaeology
- Chemical Thermodynamics and Molecular Structure
- Rock Mechanics and Modeling
- Theoretical and Computational Physics
- Geotechnical and Geomechanical Engineering
- Geophysics and Gravity Measurements
- Geophysics and Sensor Technology
- Geophysical Methods and Applications
- Structural Health Monitoring Techniques
- Neural Networks and Applications
- Fatigue and fracture mechanics
University of Bologna
2011-2022
Osservatorio astronomico di Bologna
2013-2018
Bologna Research Area
1985-2002
University of Messina
1983-1984
Institute of Geosciences and Earth Resources
1978-1979
Istituto Nazionale per la Fisica della Materia
1977-1979
University of California, Los Angeles
1979
Ospedali Riuniti di Ancona
1976
Can the time, location, and magnitude of future earthquakes be predicted reliably accurately? In their Perspective, Geller et al .'s answer is “no.” Citing recent results from physics nonlinear systems “chaos theory,” they argue that any small earthquake has some chance cascading into a large event. According to research cited by authors, whether or not this happens depends on unmeasurably fine details conditions in Earth's interior. Earthquakes are therefore inherently unpredictable. ....
We present a narrative of the eruptive events culminating in cataclysmic January 15, 2022 eruption Hunga Tonga-Hunga Ha'apai Volcano by synthesizing diverse preliminary seismic, volcanological, sound wave, and lightning data available within first few weeks after occurred. The hour activity produced fast-propagating tsunami waves, long-period seismic loud audible infrasonic exceptionally intense volcanic an unsteady plume that transiently reached—at 58 km—the Earth's mesosphere. Energetic...
Research Article| July 01, 2008 Vs30: Proxy for Seismic Amplification? Silvia Castellaro; Castellaro Dipartimento di Fisica, Settore Geofisica Università Bologna Bologna, Italy silvia.castellaro@unibo.it (S.C.) Search other works by this author on: GSW Google Scholar Francesco Mulargia; Mulargia Piermaria Luigi Rossi Author and Article Information Publisher: Seismological Society of America First Online: 09 Mar 2017 Online ISSN: 1938-2057 Print 0895-0695 © the Letters (2008) 79 (4):...
Least-squares linear regression is so popular that it sometimes applied without checking whether its basic requirements are satisfied. In particular, in studying earthquake phenomena, the conditions (a) uncertainty on independent variable at least one order of magnitude smaller than dependent variable, (b) both data and uncertainties normally distributed (c) residuals constant times disregarded. This may easily lead to wrong results. As an alternative squares, when ratio between errors can...
Even though it has never been validated by objective testing, Probabilistic Seismic Hazard Analysis (PSHA) widely used for almost 50 years governments and industry in applications with lives property hanging the balance, such as deciding safety criteria nuclear power plants, making official national hazard maps, developing building code requirements, determining earthquake insurance rates. PSHA rests on assumptions now known to conflict physics; many damaging earthquakes, including 1988...
Abstract Most seismic codes adopt the average shear-wave velocity as a key parameter in first 30 m of subsoil ( V S 30 ). Estimates are therefore required for both large- and small-scale microzonation. We propose technique to measure based on horizontal vertical spectral ratio (H/V) microtremor recorded at single station. The H/V is fitted with synthetic curve using independently known thickness superficial layer constraint. proposed procedure consists three steps: (1) identify depth shallow...
Static and dynamic elastic moduli of Calcare Massiccio mudstone-limestone, the typical seismogenic rock in Italian Apennines, are measured using a standard uniaxial static compression test, dual cantilever forced oscillation test ultrasonic measurement wave velocities. These measurements cover nine decades frequency including seismic domain. Neither significant dependence nor pronounced strain amplitude was observed, providing Young's modulus (75 ± 7) GPa Poisson's ratio (0.28 0.02). values...
Abstract The evaluation of the parameters in Gutenberg-Richter (GR) frequency-magnitude law log Nr = a − bm is shown to be strongly affected by magnitude uncertainties. If errors are assumed distributed normally with standard deviation σ, observed that we call “apparent magnitude,” becomes random variable, and frequency-apparent differs from GR relation. We show there range magnitudes within which this may approximated as Na + γ2log(e). Here, γ2 β2σ2/2, [β b/log(e)], stands for apparent...
Abstract This paper presents a simple method, that is very practical tool, to compute the confidence intervals of parameter b for earthquake magnitudes grouped in classes equal width—a circumstance happens quite frequently usual applications seismology. The problem given solution which complete and covers satisfactorily all cases concern seismologist. authentic, innovative contribution that, by exploiting strict connection between frequency-magnitude Gutenberg-Richter law discrete geometric...
The high temperatures typical of shock wave phenomena and planetary interiors require the use anharmonic models accounting also for electronic effects in their description. By using a generalized form Grüneisen γ function its formulation lattice dynamics we find that at few thousand degrees Kelvin is: 1) dependent on temperature as well volume; 2) different from thermodynamical parameter by quantity same order magnitude γ. This is not contradiction with experimental data showing many solids...
The physical mechanism of the anthropogenic triggering large earthquakes on active faults is studied basis experimental phenomenology, i.e., that occur tectonic faults, crustal stress values are those measured in situ and, comply to drop for real earthquakes, static friction coefficients inferred and effective stresses earthquakes. Deriving conditions earthquake nucleation as a time-dependent solution Tresca-Von Mises criterion applied framework poroelasticity yields can be triggered by...
A theoretical expression is derived for the harmonic (in Leibfried and Ludwig [1961] sense) Grüneisen γ function by means of a Legendre polynomial expansion frequency spectrum (Thirring series). At high temperatures found to be rigorously independent temperature; postulate definition made Born also given mathematical proof, it proven that acoustical branches give an irrelevant contribution γ, as was first suggested Knopoff Shapiro [1969], The explicit temperature function, its volume...
All predictions of the future can be to some extent successful by chance. This is a crucial issue mostly overlooked in assessing validity earthquake precursors. We analyse statistically effectiveness VAN beyond chance studying complete list for period 1987 January 1–1989 November 30 recently published Varotsos & Lazaridou (1991) using any possible combination 'rules game' that they consider. find apparent success confidently ascribed chance; conversely, we occurrence earthquakes with Ms≥ 5.8...
Fractal analysis is now common in many disciplines, but its actual application often affected by methodological errors which can bias the results. These problems are commonly associated with evaluation of fractal dimension D and range scale invariance R. We show that applying most algorithms for (Walker's Ruler box counting), it always possible to obtain a dimension, this value might be physically meaningless. The chief problem number data points, bound insufficient when implemented hand....
Abstract A forecast of future occurrences larger (M ≧ 5.9) crustal earthquakes in Italy is made on the basis historic and instrumental seismicity, following a seismotectonic regionalization recently derived geological evidence combined with earthquake epicenters focal mechanisms. Completeness problems seismic catalog allow one to study only 20 regions out 58. Large seismicity within each seismogenic region modeled as either periodic Gauss process or random Poisson according experimental...
Passive seismology is burgeoning under the apparent theoretical support of diffuse acoustics. However, basic physical arguments suggest that this theory may not be applicable to seismic noise. A procedure developed establish applicability field paradigm a wavefield, based on testing latter for azimuthal isotropy and spatial homogeneity. This then applied noise recorded at 65 sites covering wide variety environmental subsoil conditions. Considering instantaneous oscillation vector measured...
It is well known that artificially inducing large amplitude vibrations on buildings produces seismic waves are detectable up to a few kilometers away. Does similar effect occur with tremors? If the tremor wave field were perturbed by presence of buildings, passive surveys in urban environment would be potentially impaired. The literature rather inconclusive this issue. We experimentally analyzed cases three most famous Italian towers: leaning tower Pisa, bell San Marco Venice, and Asinelli...