Skip to main content

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
  1. 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