#OKIDATA C5800 GEAR SLIPPING SERIES#
Additionally, accompanying a series of earthquakes (including aftershocks), a seismic velocity decrease of approximately 2% was detected in southern Fukushima Prefecture (Minato et al. The phase velocity of the Rayleigh wave decreased below 0.5%, accompanying the main shock at Tono, Iwate Prefecture (Takagi et al. An episodic SSE and low-frequency tremors were observed beginning 1 month before the earthquake in the region trenchward of the main shock’s epicenter (Ito et al. Prior to the main shock, a clear preslip was not observed near the main shock’s epicenter (Hirose 2011 Hino et al. The 2011 Tohoku-Oki earthquake ( M w9.0) occurred off the coast of mainland Japan on March 11, 2011, and prior slow earthquakes ( M w7.0) occurred off the coast of mainland Japan nearer the Japan trench about 1 month prior. However, during SSEs, changes are observed in seismic velocities, which decrease during the early parts of an SSE period and subsequently recover in the later parts. Seismic velocity decreases immediately after an earthquake, and velocities recover in proportion to the time elapsed. ( 2011) reported a velocity decrease of only 0.2% during the early part of the 2006 Guerrero SSE, and an almost complete velocity decrease recovery during the later part. ( 2016) detected velocity decreases of 3.1% and 1.4% 1 week after the 2014 northern Nagano Prefecture earthquake ( M w6.2), and recovery to velocity decreases of 1.9% and 1.1% 4 weeks after the main shock, using KiK-net data and autocorrelation functions (ACFs). 2011, 2014).Ī number of studies have reported variations in seismic velocity of between 0.1 and 5% after a main shock and accompanying SSE.
However, only a few studies have reported variations in the underground structure accompanying slow slip events (SSEs) (Rivet et al. A wide variety of techniques have been used in many regions, and most studies have reported variations in the seismic velocity structure accompanying large earthquakes.
Similarly, other studies have reported decreases in seismic velocity accompanied by large earthquakes in several regions, such as Japan and Sumatra (e.g., Nimiya et al. ( 2009) reported a decrease in seismic velocity of 0.5% after the 2004 mid-Niigata earthquake ( M w6.6) based on seismic interferometry applied to ambient noise. While seismic interferometry has a high temporal resolution (equivalent to analyses using an artificial source), it does not require an artificial source. Seismic interferometry is one of the most powerful techniques for obtaining Green’s functions. These results suggest the possibility of detecting low-frequency tremors using ACF monitoring. These may have been caused by temporal variations in the ambient noise source distributions, resulting from low-frequency tremors. Moreover, for most of the OBSs, we observed temporal variations in the autocorrelation functions (ACFs) during the low-frequency tremors. In addition, we observed very small temporal increases in seismic velocity near the SSE fault during the initial SSE stage. In the region above the large coseismic slip area, we detected a 1–2% seismic velocity decrease after the main shock. We used our technique to detect temporal variations in seismic velocity caused by the main shock, SSE, and low-frequency tremors. Here, we applied a seismic interferometry technique using ambient noise to data from 17 ocean bottom seismometers (OBSs) installed above the focal region before the main shock. Before the 2011 Tohoku-Oki earthquake ( M w9.0) near the Japan Trench, a slow slip event (SSE, M w7.0) and low-frequency tremors were observed near the trench. If you have more questions about our products see F.A.Q page.Seismic interferometry is one of the most effective techniques for detecting temporal variations in seismic velocity caused by large earthquakes. At the check out you can pay with Credit Card, echeck or payPal. You can add any number of the products to the shopping cart. Ink for sublimation printing 4x1 liter bottles Toner, set of 4 colors for Oki � c5500, c5650, c5700, c5800, 5900 series printersħ0 tooth nylon gear for Hunt Boston model 18 and 19 High efficiency flexible 12v LED strip lights with 3M � adhesive back Save 75% off compare to original supplies with little effort. These products are most popular among our customers. Please contact us to place an ad: most popular: Extensively tested on printers in our lab. These products are of good quality made by US ans foreign manufacturers.
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