In the year 2000, an anomalous sequence of off-fault seismicity was detected near Lake Pillsbury in northern California. The seismicity was interpreted by Hayes et al. (2005, 2006) to be associated with a dike injection. I completed a gravity survey over the location of the seismicity and used that data in gravity modeling, to test the hypothesis that the seismicity was directly linked to the i...

The Dolgov-Kawasaki instability discovered in the matter sector of the modified gravity scenario incorporating a −μ/R correction to Einstein gravity is studied in general f(R) theories. A stability condition is found in the metric version of these theories to help ruling out models that are unviable from the theoretical point of view. For example, the theories f(R) = R + αμ/R, where α and n are...

We formulate four-dimensional conformal gravity with (anti-)de Sitter boundary conditions that are weaker than Starobinsky boundary conditions, allowing for an asymptotically subleading Rindler term concurrent with a recent model for gravity at large distances. We prove the consistency of the variational principle and derive the holographic response functions. One of them is the conformal gravi...

In this paper, we discuss the self-consistency condition for the spherical symmetric Klein-Gordon equation. And then discuss a natural possibility that gravity and weak coupling constant gG and GW may be defined after gEM . In this point of view, gravity and the weak force is subsidiary derived from electricity. Unified solution for each particle field is calculated. ∗) E-mail: nisikawa@hep-th....

1. Closed systems have constant matter and energy. They were models for classical modern physics. I stress the "model" aspect. Newtonian physics proposes a model that allows approximations good enough for (military) technology. E.g., the center of gravity is only part of a model, a thought-entity, that allows for calculation: it doesn't exist in the same way atoms and molecules exist. (excusing...

Earthquakes far from tectonic plate boundaries generally exploit ancient faults, but not all intraplate faults are equally active. The North American Great Plains exemplify such intraplate earthquake localization, with both natural and induced seismicity generally clustered in discrete zones. Here we use seismic velocity, gravity and topography to generate a 3D lithospheric density model of the...