We investigate the validity of a proposed generalized Omori–Utsu law for the aftershock sequences for the Landers, Hector Mine, Northridge and Superstition Hills earthquakes, the four largest events in the southern California catalogue we analyse. This law unifies three of the most prominent empirical laws of statistical seismology—the Gutenberg–Richter law, the Omori–Utsu law, and a ge…

The resistivity structure of the lithospheric mantle beneath the Proterozoic Grenville Province in southern Ontario, Canada is investigated using 84 magnetotelluric (MT) sites divided into four profiles. Depth-based regional geoelectric dimensionality analyses of the MT responses indicate that the mantle lithosphere north of Lake Ontario can be subdivided into upper (45–150 km) and deeper (>2…

The early detection of the oil–water encroachment front is of prime interest during the water flooding of an oil reservoir to maximize the production of oil and to avoid the oil–water encroachment front to come too close to production wells. We propose a new 4-D inversion approach based on the Gauss–Newton approach to invert cross-well resistance data. The goal of this study is to image …

Tahun Terbit

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Tahun Terbit

2009

Tahun Terbit

2009

Tahun Terbit

2009

The spatial coherence structure of 30 infrasound array detections, with source-to-receiver ranges of 25–6500km, has been measured within the 0.25–1Hz passband. The data were recorded at International Monitoring System (IMS) microbarograph arrays with apertures of between 1 and 4 km. Such array detections are of interest for Comprehensive Nuclear-TestBan Treaty monitoring. The majority of ar…

Tahun Terbit

2009

Tahun Terbit

2009