Stratification of earth’s outermost core inferred from SmKS array data

Kaneshima, Satoshi; Matsuzawa, Takanori

doi:10.1186/s40645-015-0046-5

Progress in Earth and Planetary Science

Table 2 Differential travel times are measured on the waveforms which are obtained by linearly stacking the observed broadband seismograms with the relative slowness computed for PREM

From: Stratification of earth’s outermost core inferred from SmKS array data

Event	Array	Distance	d t ³⁻² (s)	Bias	d t ⁴⁻³ (s)	Bias	d t ⁵⁻³ (s)	Bias	Category
FEV1	EU	154.0	1.2 ± 0.2	0.1	1.0 ± 0.2	0.2	1.2 ± 0.3	0.2	A
FEV2	EU	154.0	1.1 ± 0.2	0.2	1.2 ± 0.2	0.2	1.2 ± 0.3	0.3	A
FEV3	EU	152.5	1.1 ± 0.3	0.1	1.3 ± 0.3	0.3	1.5 ± 0.4	0.2	A
FEV4	EU	152.	1.6 ± 0.2	0.2	1.3 ± 0.2	0.2	1.2 ± 0.3	0.3	A
FEV5	EU	147.3	1.5 ± 0.3	0.3	1.3 ± 0.4	0.2	1.6 ± 0.5	0.0	A
FEV6	EU	153.5	1.6 ± 0.4	0.2	0.9 ± 0.2	0.2	1.1 ± 0.4	0.1	A
FEV6	US	123.5	0.9 ± 0.3	0.3	-		-		B
FEV7	EU	148.5	1.5 ± 0.4	0.3	1.4 ± 0.3	0.4	1.3 ± 0.4	0.4	B
FEV8	EU	148.	1.1 ± 0.5	0.3	-		-		B
FEV9	EU	153.	1.2 ± 0.5	−0.1	-		-		B
FEV10	EU	151.9	0.9 ± 0.4	−0.3	-		-		B
FEV11	EU	151.9	1.1 ± 0.4	0.0	-		-		B
FEV12	EU	150.0	1.3 ± 0.2	0.3	1.2 ± 0.2	0.4	1.1 ± 0.3	0.3	A
FEV13	AF	131.	0.2 ± 0.3	−0.1	0.2 ± 0.2	−0.1	-		B
KEV1	EU	155.	1.2 ± 0.2	0.3	1.2 ± 0.3	0.4	1.0 ± 0.4	0.4	A
KEV2	EU	153.	1.9 ± 0.4	0.2	1.0 ± 0.3	0.2	-		B
KEV3	EU	155.	1.4 ± 0.4	0.2	-		-		B
KEV4	EU	155.	1.6 ± 0.5	0.4	1.5 ± -	0.4	-		B
KEV5	EU	155.5	1.2 ± 0.4	0.3	1.2 ± 0.4	0.2	1.5 ± 0.5	0.1	A
KEV6	EU	155.	1.4 ± 0.3	0.2	1.5 ± 0.5	0.3	-		B
AEV1	JP	162.4	0.5 ± 0.4	0.1	0.9 ± 0.4	0.2	-		B
AEV2	HI	157.8	0.9 ± 0.4	−0.1	1.3 ± 0.2	0.2	1.4 ± 0.3	−0.1	A
AEV3	HI	162.6	0.5 ± 0.5	0.0	0.9 ± 0.4	0.2	0.8 ± 0.5	0.2	B
AEV4	HI	160.0	0.6 ± 0.3	−0.1	0.6 ± 0.3	0.3	0.5 ± 0.3	0.2	A
AEV4	AU	124.8	0.7 ± 0.3	0.6	-		-		B
AEV4	AS	167.9	1.0 ± 0.4	0.0	-		-		B
AEV5	JP	163.4	1.0 ± 0.4	0.0	-		-		B
AEV5	AU	124.7	0.6 ± 0.4	0.4	-		-		B
AEV5	AS	167.8	1.0 ± 0.4	0.0	1.4 ± 0.5	0.6	-		B
AEV6	JP	153.9	0.6 ± 0.4	−0.1	-		-		B
NCEV	AU	140.1	2.0 ± 0.5	0.7	1.0 ± 0.5	0.3	-		B
IEV1	US	130.9	1.3 ± 0.4	0.2	-		-		B
IEV2	EU	122.8	0.9 ± 0.4	0.1	-		-		B
IEV2	US	119.5	0.9 ± 0.4	0.1	-		-		B
IEV3	US	120.9	0.8 ± 0.5	−0.4	-		-		B
IEV4	US	144.	1.0 ± 0.4	0.4	1.0 ± 0.5	0.4	0.9 ± 0.5	0.5	A
IEV5	US	141.	0.9 ± 0.3	0.1	0.3 ± 0.3	0.0	0.3 ± 0.5	0.2	A
IEV6	US	133.1	0.4 ± 0.2	0.2	0.1 ± 0.3	−0.2	-		B
MEV	US	149.2	1.0 ± 0.5	0.2	-		-		B
INEV	US	168.6	0.2 ± 0.5	−0.3	1.2 ± 0.4	0.5	-		B
SEV1	AK	154.1	0.4 ± 0.5	0.1	-		-		B
SEV1	JP	153.8	0.9 ± 0.3	0.2	-		-		A
PEV1	SA	149.5	1.9 ± 0.3	0.5	0.5 ± 0.5	0.6	-		B

Array distances correspond to approximate array centers, whose accurate value do not affect the results. The values of “Bias” are measured by applying the array method on the reflectivity seismograms computed for PREM and comparing the differential SmKS travel times with the ray theoretical predictions

Back to article page