5:15 PM - 6:30 PM
[SEM05-P06] A paleointensity study on historical and 14C dated lavas in Hawaii Island using the Tsunakawa-Shaw method
Keywords:Paleointensity, Hawaii, lava
For that period, 72 site-mean Hawaiian paleointensities obtained by the Thellier-type method with pTRM checks can be selected from the GEOMAGIA50.v3 database (Brown et al., 2015), applying the same site-level selection criteria. 48 site-means of them are from surface lavas mainly covering the last 5 kyr (4 data, Coe et al. (1978); 5 data, Tanaka and Kono (1991); 12 data, Mankinen et al. (1993); 1 data, Cottrell and Tarduno (1999); 1 data, Chauvin et al. (2005); 18 data, Pressling et al. (2006); 7 data, Pressling et al. (2007)) while the other 24 site-means are from the Hawaiian Scientific Drilling Project (HSDP) cores mainly spanning the last 5-24 kyr (12 data, Teanby et al. (1991); 1 data, Laj and Kissel (1999); 11 data, Laj et al. (2002)). They show a general increasing trend from about 25 microT at around -22000 yr AD toward about 60 microT at around -3000 yr AD, and a high intensity period of the last 5 kyr with the average of 57.2 microT (standard deviation of 12.3 microT). Our new data appear to confirm basically this trend as well as this high intensity period, but to result in somewhat lower paleointensities as is evidenced by the average intensity of 45.8 microT (standard deviation of 10.0 microT) for the last 5 kyr.