TY  - JOUR
A1  - Le Friant, A.
A1  - Ishizuka, O.
A1  - Boudon, G.
A1  - Palmer, M. R.
A1  - Talling, P. J.
A1  - Villemant, B.
A1  - Adachi, T.
A1  - Aljahdali, M.
A1  - Breitkreuz, C.
A1  - Brunet, M.
A1  - Caron, B.
A1  - Coussens, M.
A1  - Deplus, C.
A1  - Endo, D.
A1  - Feuillet, N.
A1  - Fraas, A. J.
A1  - Fujinawa, A.
A1  - Hart, M. B.
A1  - Hatfield, R. G.
A1  - Hornbach, M.
A1  - Jutzeler, M.
A1  - Kataoka, K. S.
A1  - Komorowski, J. -C.
A1  - Lebas, E.
A1  - Lafuerza, S.
A1  - Maeno, F.
A1  - Manga, M.
A1  - Martinez-Colon, M.
A1  - McCanta, M.
A1  - Morgan, S.
A1  - Saito, T.
A1  - Slagle, A.
A1  - Sparks, S.
A1  - Stinton, A.
A1  - Stroncik, Nicole
A1  - Subramanyam, K. S. V.
A1  - Tamura, Yui
A1  - Trofimovs, J.
A1  - Voight, B.
A1  - Wall-Palmer, D.
A1  - Wang, F.
A1  - Watt, S. F. L.
T1  - Submarine record of volcanic island construction and collapse in the Lesser Antilles arc: First scientific drilling of submarine volcanic island landslides by IODP Expedition 340
JF  - Geochemistry, geophysics, geosystems
N2  - IODP Expedition 340 successfully drilled a series of sites offshore Montserrat, Martinique and Dominica in the Lesser Antilles from March to April 2012. These are among the few drill sites gathered around volcanic islands, and the first scientific drilling of large and likely tsunamigenic volcanic island-arc landslide deposits. These cores provide evidence and tests of previous hypotheses for the composition and origin of those deposits. Sites U1394, U1399, and U1400 that penetrated landslide deposits recovered exclusively seafloor sediment, comprising mainly turbidites and hemipelagic deposits, and lacked debris avalanche deposits. This supports the concepts that i/ volcanic debris avalanches tend to stop at the slope break, and ii/ widespread and voluminous failures of preexisting low-gradient seafloor sediment can be triggered by initial emplacement of material from the volcano. Offshore Martinique (U1399 and 1400), the landslide deposits comprised blocks of parallel strata that were tilted or microfaulted, sometimes separated by intervals of homogenized sediment (intense shearing), while Site U1394 offshore Montserrat penetrated a flat-lying block of intact strata. The most likely mechanism for generating these large-scale seafloor sediment failures appears to be propagation of a decollement from proximal areas loaded and incised by a volcanic debris avalanche. These results have implications for the magnitude of tsunami generation. Under some conditions, volcanic island landslide deposits composed of mainly seafloor sediment will tend to form smaller magnitude tsunamis than equivalent volumes of subaerial block-rich mass flows rapidly entering water. Expedition 340 also successfully drilled sites to access the undisturbed record of eruption fallout layers intercalated with marine sediment which provide an outstanding high-resolution data set to analyze eruption and landslides cycles, improve understanding of magmatic evolution as well as offshore sedimentation processes.
KW  - landslide
KW  - volcanic island
KW  - debris avalanche
KW  - seafloor sediment failure
KW  - tsunami
KW  - IODP
Y1  - 2015
U6  - https://doi.org/10.1002/2014GC005652
SN  - 1525-2027
VL  - 16
IS  - 2
SP  - 420
EP  - 442
PB  - American Geophysical Union
CY  - Washington
ER  - 
TY  - JOUR
A1  - Liese, A. D.
A1  - Schulz, M.
A1  - Fang, F.
A1  - Wolever, T. M. S.
A1  - D'Agostino, R. B.
A1  - Sparks, K. C.
A1  - Mayer-Davis, E. J.
T1  - Dietary glycemic index and glycemic load, carbohydrate and fiber intake, and measures of insulin sensitivity, secretion, and adiposity in the Insulin Resistance Atherosclerosis Study
N2  - OBJECTIVE - We studied the association of digestible carbohydrates, fiber intake, glycemic index, and glycemic load with insulin sensitivity (S-I), fasting insulin, acute insulin response (AIR), disposition index, BMI, and waist circumference. RESEARCH DESIGN AND METHODS - Data on 979 adults with normal (67%) and impaired (33%) glucose tolerance from the Insulin Resistance Atherosclerosis Study (1992-1994) were analyzed. Usual dietary intake was assessed via a 114- item interviewer-administered food frequency questionnaire from which nutrient intakes were estimated. Published glycemic index values were assigned to food items and average dietary glycemic index and glycemic load calculated per subject. S-I and AIR were determined by frequently sampled intravenous glucose tolerance test. Disposition index was calculated by multiplying S-I with AIR. Multiple linear regression modeling was employed. RESULTS - No association was observed between glycemic index and S-I fasting insulin, AIR, disposition index, BMI, or waist circumference after adjustment for demographic characteristics or family history of diabetes, energy expenditure, and smoking. Associations observed for digestible carbohydrates and glycemic load, respectively, with S-I insulin secretion, and adiposity (adjusted for demographics and main confounders) were entirely explained by energy intake. In contrast, fiber was associated positively with S-I and disposition index and inversely with fasting insulin, BMI, and waist circumference but not with AIR. CONCLUSION - Carbohydrates as reflected in glycemic index and glycemic load may not be related to measures of insulin sensitivity, insulin secretion, and adiposity. Fiber intake may not only have beneficial effects. on insulin sensitivity and adiposity, but also on pancreatic functionality
Y1  - 2005
SN  - 0149-5992
ER  -