The C1-ungrouped carbonaceous chondrite Flensburg fell in Germany on September 12, 2019, the daytime. We determined atmospheric trajectory, velocity, and heliocentric orbit using one dedicated AllSky6 meteor camera three casual video records of bolide. It was found that meteorite originated vicinity 5:2 resonance with Jupiter at distance 2.82 AU. When combined bolide energy reported by U.S. Gov...

in 2012 august 11 (12:23 utc) a moderate earthquake with mw=6.4 (usgs) occurred between ahar and varzaghan towns in azarbayjan province at northwest of iran. after eleven minutes another earthquake shook the area with mw=6.2 (usgs). these consecutive earthquakes followed by intensive sequences of aftershocks whereas the strongest one had mw=5.3 (usgs). in data processing including depth modific...

After decades of using only one map projection, the Polyconic, for its mapping program, the U.S. Geological Survey (USGS) now uses several of the more common projections for its published maps. For larger scale maps, including topographic quadrangles and the State Base Map Series, conformal projections such as the Transverse Mercator and the Lambert Conformal Conic are used. Equal-area and equi...

A USGS scientist collects data from an automated sampling system moored in Malibu Lagoon (July 2009). Photograph by John Izbicki, USGS. Each year, over 550 million people visit California’s public beaches. To protect beach-goers from exposure to waterborne disease, California state law requires water-quality monitoring for fecal indicator bacteria (FIB), such as enterococci and Escherichia coli...

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A vectorized polynomial preconditioned conjugate gradient (PPCG) numerical algorithm is presented as an additional solver package interfaced with the Modular Three-Dimensional Finite Diierence GroundWater Flow Model 1] (hereafter called the USGS model). The USGS model with its existing strongly implicit procedure (SIP) and slice-successive overrelaxation (SSOR) solution packages and with the ne...