Japan Geoscience Union最新文献

{"title":"Tectonic Landform and Paleoseismic Activity of the Northernmost Sumatran Fault, Aceh Province, Indonesia","authors":"H. Tsutsumi, Y. Soeda, N. Ismail, Bukhari Ali, T. Tabei","doi":"10.1002/ESSOAR.10504162.1","DOIUrl":"https://doi.org/10.1002/ESSOAR.10504162.1","url":null,"abstract":"The Sumatran fault is an arc-parallel dextral strike-slip fault that accommodates much of the right-lateral component of oblique subduction of the Indian-Australian plate beneath the Sunda plate. T...","PeriodicalId":14836,"journal":{"name":"Japan Geoscience Union","volume":"527 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80145326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of original orbits of Oort Cloud new comets given in various catalogues II. Different solutions from different observations","authors":"Takashi Ito","doi":"10.1002/essoar.10503960.1","DOIUrl":"https://doi.org/10.1002/essoar.10503960.1","url":null,"abstract":"Nearly isotropic comets with very long orbital period are supposed to come from the Oort Cloud. Recent observational and theoretical studies have greatly revealed the dynamical nature of this cloud...","PeriodicalId":14836,"journal":{"name":"Japan Geoscience Union","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86439230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simple Topographic Parameter for Along-trench Friction Distribution of Shallow Megathrust Fault","authors":"H. Koge, J. Ashi, Jin-Oh Park, A. Miyakawa","doi":"10.1002/essoar.10503484.1","DOIUrl":"https://doi.org/10.1002/essoar.10503484.1","url":null,"abstract":"In the 2011 Tohoku-Oki earthquake, the rupture in the subduction megathrust reached the trench axis and triggered a large tsunami. The shallow portion of the subduction megathrust fault was regarde...","PeriodicalId":14836,"journal":{"name":"Japan Geoscience Union","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79949136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Detailed Spatial Slip Distribution for Short-term Slow Slip Events along the Nankai Subduction Zone, Southwest Japan","authors":"M. Kano, A. Kato","doi":"10.1002/essoar.10502407.1","DOIUrl":"https://doi.org/10.1002/essoar.10502407.1","url":null,"abstract":"","PeriodicalId":14836,"journal":{"name":"Japan Geoscience Union","volume":"153 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91443403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Near real time plasma irregularity monitoring by FORMOSAT-7/COSMIC-2","authors":"Shih‐Ping Chen, C. Lin, Rajesh Panthalingal Krishnanunni, R. Eastes, Jong‐Min Choi","doi":"10.5194/egusphere-egu2020-13366","DOIUrl":"https://doi.org/10.5194/egusphere-egu2020-13366","url":null,"abstract":"The near real-time global plasma bubble map is constructed by utilizing the FORMOSAT-7/COSMIC-2(F7/C2) radio occultation(RO) scintillation observations in low latitudes. Several tools investigating plasma bubbles like the rate of TEC index(ROTI), Range-TimeIntensity(RTI) diagrams of the Jicamarca Unattended Long-term Investigations of the Ionosphere and Atmosphere(JULIA), and the Global-scale Observations of the Limb and Disk(GOLD) 135.6nm airglow observations are provided validating the RO scintillations. Result shows that the F7/C2 scintillation is sensitive detecting plasma irregularities, especially for the bottom side of these bubbles, which can be used to investigating nighttime vertical plasma drifts in low latitudinal Fregion. The hourly quick look of the low latitude plasma bubble occurrence and vertical ion drift around the globe is significant to the space weather monitoring.","PeriodicalId":14836,"journal":{"name":"Japan Geoscience Union","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80669695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Standardized Variability Index (SVI): A multiscale index to assess the variability of precipitation","authors":"R. Guntu, A. Agarwal","doi":"10.1002/essoar.10503941.1","DOIUrl":"https://doi.org/10.1002/essoar.10503941.1","url":null,"abstract":"Quantifying the spatiotemporal variability of precipitation is the principal component for the assessment of the impact of climate change on the hydrological cycle. A better understanding of the qu...","PeriodicalId":14836,"journal":{"name":"Japan Geoscience Union","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75105385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Antarctic warmth in the last interglacial driven by Northern insolation and deglaciation","authors":"T. Obase, A. Abe‐Ouchi, F. Saito","doi":"10.5194/egusphere-egu21-8145","DOIUrl":"https://doi.org/10.5194/egusphere-egu21-8145","url":null,"abstract":"<p>The global mean sea level in the last interglacial (LIG, about 130,000 to 115,000 years before present) was very likely higher than the present level, driven mainly by mass loss of the Antarctic ice sheet. Some studies have suggested that this mass loss may have been caused by the warmer temperature over the Southern Ocean in the LIG compared with the present interglacial. However, the ultimate cause of the difference in Antarctic warming between the last and current interglacials has not been explained. Here, based on transient simulations of the last deglaciation using a fully coupled ocean&#8211;atmosphere model, we show that greater meltwater (by a factor of 1.5 relative to the last deglaciation) during the middle and later stages of the deglaciation could have produced the difference in Antarctic warmth. Northern Hemisphere ice sheet model experiments suggest that the difference in meltwater was caused by slightly smaller orbital eccentricity in our current interglacial than in the LIG, indicating that mass loss of the Antarctic ice sheet is influenced by the preceding northern summer insolation and disintegration of Northern Hemisphere ice sheets.</p>","PeriodicalId":14836,"journal":{"name":"Japan Geoscience Union","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81882157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pressure-to-depth conversion models for metamorphic rocks: derivation and applications","authors":"A. Bauville, P. Yamato","doi":"10.1002/essoar.10503542.1","DOIUrl":"https://doi.org/10.1002/essoar.10503542.1","url":null,"abstract":"Pressure-to-depth conversion is a crucial step towards geodynamic reconstruction but remains strongly debated. Here, we derive pressure-to-depth conversion models using either one or two pressure d...","PeriodicalId":14836,"journal":{"name":"Japan Geoscience Union","volume":"63 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74005507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Overpressured underthrust sediment in the Nankai Trough forearc inferred from high-frequency receiver function inversion","authors":"T. Akuhara, T. Tsuji, T. Tonegawa","doi":"10.1002/essoar.10502717.1","DOIUrl":"https://doi.org/10.1002/essoar.10502717.1","url":null,"abstract":"Active-source seismic surveys have resolved the fine-scale P-wave velocity (Vp) of the subsurface structure in subduction forearcs. In contrast, the S-wave velocity (Vs) structure is poorly resolve...","PeriodicalId":14836,"journal":{"name":"Japan Geoscience Union","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78119954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improving the Observation Operator for the Phased Array Weather Radar in the SCALE-LETKF System","authors":"A. Amemiya, T. Honda, T. Miyoshi","doi":"10.2151/sola.2020-002","DOIUrl":"https://doi.org/10.2151/sola.2020-002","url":null,"abstract":"The observation operator of Phased Array Weather Radar (PAWR; Ushio et al. 2014; Yoshikawa et al. 2013) in the SCALE-LETKF data assimilation system (Lien et al., 2017) is revisited, and the impact of improving the observation operator on the analysis is examined. Previous studies (Miyoshi et al., 2016, IEEE; Miyoshi et al., 2016, BAMS) have shown that the three-dimensional fine-scale structure of radar signals observed by PAWR can be successfully assimilated to produce a high-resolution analysis using a regional model SCALE-RM and the local ensemble transformed Kalman filter (LETKF). Forecasts using a high-resolution regional model from the analysis field has a potential to provide reliable precipitation forecasts for longer period of time than a simple nowcasting technique based on an advection scheme, since the explicit physical processes would allow us to capture the development of new convective cells. However, even with an analysis field incorporating such detailed observational data, accurate forecasting of localized convection systems is generally a challenging issue. In the previous studies mentioned above, there was a known problem that the area of strong radar echo calculated from the forecast field starts to expand unrealistically even within several minutes. Along with systematic model biases and imbalance, the observation operator could be the cause of this misrepresentation. Therefore, the observation operator of PAWR is revisited in this study. The observation operator calculates equivalent radar reflectivity factor (Ze [mm6/m3] ) from hydrometeor mass density of each particle categories (W [g/m]). The cloud microphysics scheme in SCALE-RM (Tomita et al., 2008) is a 1-moment 6-caterogy scheme. They include 3 categories for precipitation particles, namely, rain, snow, and graupel. The relation between Ze and each of W is obtained by an offline numerical calculation of Mie scattering and approximated in the form of an exponential function. Ze=αrexp(βr)+αsexp(βs)+αgexp(βg) Previous studies used values from a literature (Xue et al., 2009) for the coefficients. However, the coefficients used for graupel (αg and βg) has been originally calculated using assumptions about the particle size distribution different from those in SCALE-RM. In particular, a multiplicative factor of the particle size distribution of graupel in SCALE-RM is much smaller in their calculation (N0=3×10 4 m) than that in SCALE-RM (N0=4×10 6 m). This leads to an underestimation in sensitivity of graupel mass to observed radar reflectivity factor. The new coefficients for graupel are chosen to be consistent with the SCALE-RM cloud microphysics scheme using the Joint-Simulator developed by Japan Aerospace Exploration Agency (JAXA). The results are αg=5.54×10 3 ,βg=1.70 , where the original values from the literature are αg=8.18×10 4,βg=1.50 . The case study of PAWR assimilation on the localized short-duration heavy rain event on July 13, 2013 is performed again using the","PeriodicalId":14836,"journal":{"name":"Japan Geoscience Union","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90854053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}