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Full-Text Articles in Physical Sciences and Mathematics
Seafloor Geodesy In Shallow Water With Gps On An Anchored Spar Buoy, Surui Xie, Jason Law, Randy Russell, Timothy H. Dixon, Chad Lembke, Rocco Malservisi, Melanie Rodgers, Giovanni Iannaccone, Sergio Guardato, D. F. Naar
Seafloor Geodesy In Shallow Water With Gps On An Anchored Spar Buoy, Surui Xie, Jason Law, Randy Russell, Timothy H. Dixon, Chad Lembke, Rocco Malservisi, Melanie Rodgers, Giovanni Iannaccone, Sergio Guardato, D. F. Naar
School of Geosciences Faculty and Staff Publications
Measuring seafloor motion in shallow coastal water is challenging due to strong and highly variable oceanographic effects. Such measurements are potentially useful for monitoring near‐shore coastal subsidence, subsidence due to petroleum withdrawal, strain accumulation/release processes in subduction zones and submerged volcanoes, and certain freshwater applications, such as volcano deformation in caldera‐hosted lakes. We have developed a seafloor geodesy system for this environment based on an anchored spar buoy topped by high‐precision GPS. Orientation of the buoy is measured using a digital compass that provides heading, pitch, and roll information. The combined orientation and GPS tracking data are used to recover …
Strain Release At The Trench During Shallow Slow Slip: The Example Of Nicoya Peninsula, Costa Rica, Yan Jiang, Zhen Liu, Earl E. Davis, Susan Y. Schwartz, Timothy H. Dixon, Nicholas K. Voss, Rocco Malservisi, Marino Protti
Strain Release At The Trench During Shallow Slow Slip: The Example Of Nicoya Peninsula, Costa Rica, Yan Jiang, Zhen Liu, Earl E. Davis, Susan Y. Schwartz, Timothy H. Dixon, Nicholas K. Voss, Rocco Malservisi, Marino Protti
School of Geosciences Faculty and Staff Publications
The near‐trench behavior of subduction megathrust faults is critical for understanding earthquake hazard and tsunami generation. The shallow subduction interface is typically located in unconsolidated sediments that are considered too weak to accumulate elastic strain. However, the spectrum of shallow fault slip behavior is still elusive, due in large part to the lack of near‐field observations. Here we combine measurements from seafloor pressure sensors near the trench and an onshore GPS network in a time‐dependent inversion to image the initiation and migration of a well‐documented slow slip event (SSE) in 2007 at the Nicoya Peninsula, Costa Rica. Our results show …
A New Method To Assess Long‐Term Sea‐Bottom Vertical Displacement In Shallow Water Using A Bottom Pressure Sensor: Application To Campi Flegrei, Southern Italy, Francesco Chierici, Giovanni Iannaccone, Luca Pignagnoli, Sergio Guardato, Marina Locritani, Davide Embriaco, Gian P. Donnarumma, Mel Rodgers, Rocco Malservisi, Laura Beranzoli
A New Method To Assess Long‐Term Sea‐Bottom Vertical Displacement In Shallow Water Using A Bottom Pressure Sensor: Application To Campi Flegrei, Southern Italy, Francesco Chierici, Giovanni Iannaccone, Luca Pignagnoli, Sergio Guardato, Marina Locritani, Davide Embriaco, Gian P. Donnarumma, Mel Rodgers, Rocco Malservisi, Laura Beranzoli
School of Geosciences Faculty and Staff Publications
We present a new methodology using bottom pressure recorder (BPR) measurements in conjunction with sea level, water column, and barometric data to assess the long‐term vertical seafloor deformation to a few centimeters accuracy in shallow water environments. The method helps to remove the apparent vertical displacement on the order of tens of centimeters caused by the BPR instrumental drift and by seawater density variations. We have applied the method to the data acquired in 2011 by a BPR deployed at 96 m depth in the marine sector of the Campi Flegrei Caldera, during a seafloor uplift episode of a few …