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A combination of tides and nontidal variations in ocean bottom pressure may generate interannual slip fluctuations in the transition zone along a subduction plate interface
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作者 yoshiyuki tanaka Hiromu Sakaue +1 位作者 Masayuki Kano Suguru Yabe 《Geodesy and Geodynamics》 CSCD 2023年第1期43-51,共9页
The tidal triggering of earthquakes has been studied for many years.The discovery of slow earthquakes in the early 2000s,including slow slip,has urged scientists to investigate the tidal responses of these earthquakes... The tidal triggering of earthquakes has been studied for many years.The discovery of slow earthquakes in the early 2000s,including slow slip,has urged scientists to investigate the tidal responses of these earthquakes due to their sensitivity to weak stress perturbations.Previous studies have shown that slow earthquakes correlate with diurnal and semidiurnal tides and seasonal variations in surface loads more clearly than ordinary earthquakes.However,little is known about long-term responses to external stresses.In this paper,based on a widely accepted frictional law for faults,a mechanism is proposed by which nontidal variations in ocean bottom pressure,when combined with tides,pro mote the occurrence of slow earthquakes.Because slow earthquakes accompany a slip on the plate interface,this mechanism allows one to estimate slip modulations.A one-degree-of-freedom slip model is constructed and applied to Ise Bay in the Tonankai region of southwestern Japan,where large-scale ocean mass redistributions have occurred.The model calculated with parameters determined from the observation of tectonic tremors is quantitatively consistent with the slip during 1997-2013 inferred from GNSS data,suggesting that the decrease in the sea-level change in approximately 2006 could cause the accele ration of a slip observed after that.This result implies that the decreases in sea level in approximately 1996 and 2014 could also cause subsequent slip accelerations.These three slip acceleration periods temporally coincide with the increases in background seismicity in a shallower portion of the plate interface.These changes in seismicity are common to shallow earthquakes in the Tokai area,and a similar model can reproduce them.Further studies are expected to reveal causality between shallow earthquakes and long-term slip fluctuations based on modeling that considers changes in the frictional property along the plate interface. 展开更多
关键词 TIDES Ocean bottom pressure Slow earthquake SEISMICITY Kuroshio current
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分子标记辅助选择在含辣椒素酯的辣椒新品种选育中的应用 被引量:4
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作者 yoshiyuki tanaka Hirotsugu Yoneda +4 位作者 Munetaka Hosokawa Tetsuya Miwa Susumu Yazawa 马义花 孔秋生 《辣椒杂志》 2014年第4期45-49,共5页
辣椒素酯类物质是辣椒果实中低辣味的辣椒素类似物。其生物活性与辣椒素类物质相似,有抑制脂肪积累和抗氧化等特性。由于辣椒素酯类物质的辣味低,与辣椒素相比更易于制作食品添加剂。但是辣椒素酯类物质有水不稳定和热不稳定性,其含量... 辣椒素酯类物质是辣椒果实中低辣味的辣椒素类似物。其生物活性与辣椒素类物质相似,有抑制脂肪积累和抗氧化等特性。由于辣椒素酯类物质的辣味低,与辣椒素相比更易于制作食品添加剂。但是辣椒素酯类物质有水不稳定和热不稳定性,其含量随果实的成熟而逐渐降低。所以,含有辣椒素酯的果实适合在成熟之前鲜食。以前的遗传研究表明p-AMT和Pun1两个基因控制辣椒素酯的合成,这两个基因分别表示为A、B。基因型为aa BB和aa Bb的植株果实中含辣椒素酯,辣味较低。本研究在杂交育种中利用p-AMT和Pun1基因的DNA标记选育了一个含有辣椒素酯类物质的辣椒新品种。Murasaki(AAbb)和CH-19 Sweet(aa BB)杂交后代的基因型都用DNA标记进行了鉴定。p-AMT基因型利用d CAPS标记鉴定,Pun1基因型用SCAR标记鉴定。分析杂交后代的基因型,筛选出基因型aa BB或者aa Bb的植株并培育出了一个新品种Maru Salad。Maru Salad果实的辣椒素酯含量为700μg/g DW。同时Maru Salad的果实比CH-19 Sweet大,而且适合鲜食。 展开更多
关键词 CH-19 SWEET dCAPS SCAR 假定的氨基转移酶 假定的酰基转移酶
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Coseismic gravity and displacement changes of Japan Tohoku earthquake(Mw 9.0) 被引量:2
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作者 Xinlin Zhang Shuhei Okubo +1 位作者 yoshiyuki tanaka Hui Li 《Geodesy and Geodynamics》 2016年第2期95-100,共6页
The greatest earthquake in the modern history of Japan and probably the fourth greatest in the last 100 years in the world occurred on March 11, 2011 off the Pacific coast of Tohoku.Large tsunami and ground motions ca... The greatest earthquake in the modern history of Japan and probably the fourth greatest in the last 100 years in the world occurred on March 11, 2011 off the Pacific coast of Tohoku.Large tsunami and ground motions caused severe damage in wide areas, particularly many towns along the Pacific coast. So far, gravity change caused by such a great earthquake has been reported for the 1964 Alaska and the 2010 Maule events. However, the spatial-temporal resolution of the gravity data for these cases is insufficient to depict a co-seismic gravity field variation in a spatial scale of a plate subduction zone. Here, we report an unequivocal co-seismic gravity change over the Japanese Island, obtained from a hybrid gravity observation(combined absolute and relative gravity measurements). The time interval of the observation before and after the earthquake is within 1 year at almost all the observed sites, including 13 absolute and 16 relative measurement sites, which deduced tectonic and environmental contributions to the gravity change. The observed gravity agrees well with the result calculated by a dislocation theory based on a self-gravitating and layered spherical earth model. In this computation, a co-seismic slip distribution is determined by an inversion of Global Positioning System(GPS) data. Of particular interest is that the observed gravity change in some area is negative where a remarkable subsidence is observed by GPS, which can not be explained by simple vertical movement of the crust. This indicated that the mass redistribution in the underground affects the gravity change. This result supports the result that Gravity Recovery and Climate Experiment(GRACE) satellites detected a crustal dilatation due to the 2004 Sumatra earthquake by the terrestrial observation with a higher spatial and temporal resolution. 展开更多
关键词 Tohoku earthquake(Mw 9.0) Co-seismic gravity change Co-seismic displacement change Coseismic geoid change Dislocation theory Global Positioning System Absolute gravity measurement Relative gravity measurement
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城市垃圾焚烧站重金属废水的处理
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作者 yoshiyuki tanaka 张杰 《世界环境》 1989年第2期23-26,共4页
1.前言所谓“垃圾处理”是从产生垃圾到最后处置的全过程。随着工业的发展与人民生活水平的提高,垃圾的质量和种类与数量都日益增多,处理方法也更加复杂。本文将对城市垃圾焚烧站重金属废水处理现状与存在的问题作一全面介绍。
关键词 重金属废水 垃圾焚烧 垃圾处理 凝聚沉淀法 净化处理 鳌合树脂 污水水质 废水净化 树脂吸附法 处理方法
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