Magma and fluid migration at Yellowstone Caldera in the last three decades inferred from InSAR, leveling and gravity measurements

We studied the Yellowstone caldera geological unrest between 1977 and 2010 by investigating temporal changes in differential Interferometric Synthetic Aperture Radar (InSAR), precise spirit leveling and gravity measurements. The analysis of the 1992–2010 displacement time series, retrieved by applying the SBAS InSAR technique, allowed the identification of three areas of deformation: (i) the Mallard Lake (ML) and Sour Creek (SC) resurgent domes, (ii) a region close to the Northern Caldera Rim (NCR), and (iii) the eastern Snake River Plain (SRP). While the eastern SRP shows a signal related to tectonic deformation, the other two regions are influenced by the caldera unrest. We removed the tectonic signal from the InSAR displacements, and we modeled the InSAR, leveling, and gravity measurements to retrieve the best fitting source parameters. Our findings confirmed the existence of different distinct sources, beneath the brittle-ductile transition zone, which have been intermittently active during the last three decades. Moreover, we interpreted our results in the light of existing seismic tomography studies. Concerning the SC dome, we highlighted the role of hydrothermal fluids as the driving force behind the 1977–1983 uplift; since 1983–1993 the deformation source transformed into a deeper one with a higher magmatic component. Furthermore, our results support the magmatic nature of the deformation source beneath ML dome for the overall investigated period. Finally, the uplift at NCR is interpreted as magma accumulation, while its subsidence could either be the result of fluids migration outside the caldera or the gravitational adjustment of the source from a spherical to a sill-like geometr

Four-Dimensional Yang-Mills Theory as a Deformation of Topological BF Theory

The classical action for pure Yang--Mills gauge theory can be formulated as a deformation of the topological $BF$ theory where, beside the two-form field $B$, one has to add one extra-field $\eta$ given by a one-form which transforms as the difference of two connections. The ensuing action functional gives a theory that is both classically and quantistically equivalent to the original Yang--Mills theory. In order to prove such an equivalence, it is shown that the dependency on the field $\eta$ can be gauged away completely. This gives rise to a field theory that, for this reason, can be considered as semi-topological or topological in some but not all the fields of the theory. The symmetry group involved in this theory is an affine extension of the tangent gauge group acting on the tangent bundle of the space of connections. A mathematical analysis of this group action and of the relevant BRST complex is discussed in details.Comment: 74 pages, LaTeX, minor corrections; to be published in Commun. Math. Phy

Analisis Pengaruh Kompetensi Pengurus Bumkam Dan Penyertaan Modal Terhadap Peningkatan Pendapatan Asli Kampung

Badan Usaha Milik Kampung (BUMKam) merupakan lembaga usaha kampung yang dikelola oleh masyarakat dan pemerintahan kampung dalam upaya memperkuat perekonomian kampung dan dibentuk berdasarkan kebutuhan dan potensi kampung. BUMKam merupakan pilar kegiatan ekonomi di desa yang berfungsi sebagai lembaga sosial (social institution) dan komersial (commercial institution). Permasalahan: Belum maksimalnya Pendapatan Asli Kampung yang diperoleh melalui bagi hasil BUMKam pada kampung se-Kecamatan Dente Teladas Kabupaten Tulang Bawang, sejak Tahun 2016-2017 BUMKam dibentuk dan didanai melalui penyertaan modal kampung. Tujuan penelitian dalam tesis ini adalah untuk mengkaji Pengaruh Kompetensi Pengurus BUMKam dan Penyertaan Modal terhadap Peningkatan Pendapatan Asli Kampung (PAK) pada Kecamatan Dente Teladas Kabupaten Tulang Bawang. Metode penelitian yang digunakan adalah deskriptif verifikatif dengan jumlah responden sebanyak 54 orang yang dianalisis secara deskriptif maupun kuantitatif. Hasil analisis regresi variabel kompetensi dan penyertaan modal terhadap peningkatan pendapatan asli kampung didapat persamaan Y=8,780+0,242X1+ 0,472X2. Uji hipotesis secara parsial menunjukkan bahwa terdapat pengaruh kompetensi Pengurus Bumkam terhadap peningkatan pendapatan asli kampung dengan kontribusi pengaruh sebesar 24,2%, penyertaan modal juga berpengaruh positif terhadap peningkatan pendapatan asli kampung dengan kontribusi pengaruh sebesar 47,2%. Uji hipotesis secara bersama-sama menunjukkan terdapat pengaruh positif antara kompetensi Pengurus Bumkam dan penyertaan modal terhadap peningkatan pendapatan asli kampung dengan kontribusi pengaruh sebesar32,9%. Implikasinya adalah Pemerintah Kabupaten melalui Kecamatan melaksanakan pembinaan secara periodik dengan memberikan Bimtek dan pelatihan kepada pengurus Bumkam, Pemerintah Kampung memberikan penyertaan modal pada Bumkam dari Dana Desa yang dianggarkan melalui APBKam

The Creation of the Catholic School Leadership Program at Seton Hall University

This article summarizes the development and implementation of a Catholic school leadership program at a diocesan university. Supported by university faculty as well as seminary faculty, this program offers a unique response to the training of future school leaders. The course work blends leadership theory, theology, and educational administration and is delivered via a cohort model

Uplift and magma intrusion at Long Valley caldera from InSAR and gravity measurements

The Long Valley caldera (California) formed ~760,000 yr ago following the massive eruption of the Bishop Tuff. Postcaldera volcanism in the Long Valley volcanic fi eld includes lava domes as young as 650 yr. The recent geological unrest is characterized by uplift of the resurgent dome in the central section of the caldera (75 cm in the past 33 yr) and earthquake activity followed by periods of relative quiescence. Since the spring of 1998, the caldera has been in a state of low activity. The cause of unrest is still debated, and hypotheses range from hybrid sources (e.g., magma with a high percentage of volatiles) to hydrothermal fl uid intrusion. Here, we present observations of surface deformation in the Long Valley region based on differential synthetic aperture radar interferometry (InSAR), leveling, global positioning system (GPS), two-color electronic distance meter (EDM), and microgravity data. Thanks to the joint application of InSAR and microgravity data, we are able to unambiguously determine that magma is the cause of unrest

The effect of a regular auditory context on perceived interval Duration

In the auditory domain, the perceived duration of time intervals is influenced by background sounds – the auditory context in which the intervals are embedded – even when the background may be ignored. Previous research has shown that a regular context made of evenly spaced sounds improves participants’ discrimination of intervals close in duration to the context intervals. These results have been explained in terms of attention and anticipation. The present study reconsiders the effect of context regularity, focusing on the relationships among the intervals in the context and the interval to be estimated. The influence of a regular compared to a non-regular auditory context on interval discrimination was examined with a two interval forced choice task, which required participants to discriminate between the durations of two time intervals. Duration perception was more precise when the intervals to be discriminated were preceded by a regular compared to a non-regular context. This effect of the regular context, however, was not selective for the duration of the first interval to be estimated, contrary to suggestions based on previous evidenc

Caracterização anatômica dos anéis de crescimento de espécies arbóreas de Florestas Ombrófila das Terras Baixas e Ombrófila Mista, no Estado do Paraná.

Organizado por Patricia Póvoa de Mattos, Celso Garcia Auer, Rejane Stumpf Sberze, Katia Regina Pichelli e Paulo César Botosso