Matches in SemOpenAlex for { <https://semopenalex.org/work/W1607954114> ?p ?o ?g. }
- W1607954114 endingPage "116" @default.
- W1607954114 startingPage "93" @default.
- W1607954114 abstract "The seismicity of the central New Hebrides convergent plate boundary is investigated with three sets of data: (1) large earthquakes (Ms>6.9) for the past 75 years, (2) moderate-sized earthquakes (mb>4.5 and Ms<7.0) during the past 20 years, and (3) small earthquakes (mb=2.5 to 4.5) located by local networks for several intervals of 1–2 months each since 1975 and continuously since mid-1978. The second set includes a nearly complete collection of focal mechanism solutions for events with Ms > 5 3/4 and new determinations of accurate focal depths based on analyses of P waveforms recorded by WWSSN long-period seismographs. On a regional scale the geometry of the Benioff zone is relatively uniform. Within the resolution of the data there are no major disruptions of the descending plate nor changes in direction of plate convergence along the length of the arc. However, the three data sets all indicate marked variations in the seismicity patterns along the strike of the arc. These variations together with major bathymetric and structural complexities of the interacting plates divide the interplate boundary of the central New Hebrides into segments of about 100 km in length. The segments delimit episodes of seismic rupture but may also differ significantly in the long term balance of seismic versus aseismic slippage. In the segments near Santo and northern Malekula islands seismic rupture of the interplate boundary occurred in complex sequences of large earthquakes during the period 1965–1974, whereas in the segments near southern Malekula and Efate islands seismic rupture of the boundary may not have occurred during the past 75 years. The interaction of a subducted ridge with a pre-existing seaward protrusion of the upper plate may result in an increased coupling of the converging plates in the Santo-Malekula segments. The orientation of horizontal compressive stress within the upper plate inferred from focal mechanism solutions and geological data is perpendicular to the arc in the recently ruptured segments but changes in the region between southern Malekula and Efate islands to a more complex and variable pattern found in the southern New Hebrides arc. In addition, the diffuse spatial distribution of small earthquakes in the southern Malekula and Efate segments contrasts with the concentration of small events along the presumed interplate boundary of the recently ruptured Santo segment. The unusual concentration of events at shallow depths within the upper plate in the southern Malekula segment may be evidence for loading of a locked segment of the plate boundary. Unusual features of seismicity suggest that in the Efate segment a significant component of creep may accommodate interplate slippage. A persistently high rate of occurrence of small and moderate-size events (Ms<6.5) in the Efate segment contrasts with the large fluctuations in activity associated with the major events in the recently ruptured segments. The persistent nest of activity in the Efate segment also contrasts with the relative quiescence in the adjacent segments. The most recent (1978–1979) sequence of three moderate-sized shocks (Ms=6) located in the Efate segment was caught by the local networks of seismographs and tilt measurements. Well-documented features of the temporal and spatial development of foreshocks and aftershocks include a clear migration of foreshock activity towards the epicenter of one of the mainshocks. In two cases the area of the aftershock zone expands during a period of several days to a size significantly larger than that expected for the surface wave magnitudes and body wave seismic moments of the mainshocks. For these cases tiltmeter stations on Efate Island, located at distances of 40 to 60 km from the mainshock hypocenters, did not record tilt indicative of post-seismic creep. Nevertheless, periodic releveling of a 1 km benchmark array on Efate reveals that a significant tilt of 3–4 microradians has accumulated during the four year interval between 1976 and 1980. This tilt signal could be indicative of deformation near a transition between a creeping Efate segment and an adjacent locked segment." @default.
- W1607954114 created "2016-06-24" @default.
- W1607954114 creator A5013191322 @default.
- W1607954114 creator A5021887523 @default.
- W1607954114 creator A5028563042 @default.
- W1607954114 creator A5037806247 @default.
- W1607954114 creator A5046171659 @default.
- W1607954114 creator A5068197117 @default.
- W1607954114 creator A5084850019 @default.
- W1607954114 date "2013-03-20" @default.
- W1607954114 modified "2023-10-06" @default.
- W1607954114 title "Seismicity and Tectonics of the Central New Hebrides Island ARC" @default.
- W1607954114 cites W1922023647 @default.
- W1607954114 cites W1965233196 @default.
- W1607954114 cites W1971160489 @default.
- W1607954114 cites W1976592638 @default.
- W1607954114 cites W1978866236 @default.
- W1607954114 cites W1981419143 @default.
- W1607954114 cites W1983726496 @default.
- W1607954114 cites W1988555208 @default.
- W1607954114 cites W1992438026 @default.
- W1607954114 cites W2013031972 @default.
- W1607954114 cites W2038422013 @default.
- W1607954114 cites W2053993445 @default.
- W1607954114 cites W2062196090 @default.
- W1607954114 cites W2063063845 @default.
- W1607954114 cites W2063379427 @default.
- W1607954114 cites W2065030087 @default.
- W1607954114 cites W2068946976 @default.
- W1607954114 cites W2075830619 @default.
- W1607954114 cites W2082065033 @default.
- W1607954114 cites W2085926786 @default.
- W1607954114 cites W2090028105 @default.
- W1607954114 cites W2093387778 @default.
- W1607954114 cites W2096112526 @default.
- W1607954114 cites W2098746674 @default.
- W1607954114 cites W2105658614 @default.
- W1607954114 cites W2112838866 @default.
- W1607954114 cites W2114371115 @default.
- W1607954114 cites W2118448391 @default.
- W1607954114 cites W2127150969 @default.
- W1607954114 cites W2127454332 @default.
- W1607954114 cites W2149883955 @default.
- W1607954114 cites W2154421740 @default.
- W1607954114 cites W2161170818 @default.
- W1607954114 cites W2162255628 @default.
- W1607954114 cites W2164043671 @default.
- W1607954114 cites W2169009013 @default.
- W1607954114 cites W2170969682 @default.
- W1607954114 cites W2273720096 @default.
- W1607954114 cites W2279792258 @default.
- W1607954114 cites W2285770597 @default.
- W1607954114 cites W2335724551 @default.
- W1607954114 doi "https://doi.org/10.1029/me004p0093" @default.
- W1607954114 hasPublicationYear "2013" @default.
- W1607954114 type Work @default.
- W1607954114 sameAs 1607954114 @default.
- W1607954114 citedByCount "39" @default.
- W1607954114 countsByYear W16079541142019 @default.
- W1607954114 crossrefType "book-chapter" @default.
- W1607954114 hasAuthorship W1607954114A5013191322 @default.
- W1607954114 hasAuthorship W1607954114A5021887523 @default.
- W1607954114 hasAuthorship W1607954114A5028563042 @default.
- W1607954114 hasAuthorship W1607954114A5037806247 @default.
- W1607954114 hasAuthorship W1607954114A5046171659 @default.
- W1607954114 hasAuthorship W1607954114A5068197117 @default.
- W1607954114 hasAuthorship W1607954114A5084850019 @default.
- W1607954114 hasConcept C119217923 @default.
- W1607954114 hasConcept C119477230 @default.
- W1607954114 hasConcept C127313418 @default.
- W1607954114 hasConcept C154200439 @default.
- W1607954114 hasConcept C165205528 @default.
- W1607954114 hasConcept C166957645 @default.
- W1607954114 hasConcept C205649164 @default.
- W1607954114 hasConcept C2909236549 @default.
- W1607954114 hasConcept C58097730 @default.
- W1607954114 hasConcept C63379926 @default.
- W1607954114 hasConcept C64174561 @default.
- W1607954114 hasConcept C77928131 @default.
- W1607954114 hasConcept C83176761 @default.
- W1607954114 hasConcept C97490223 @default.
- W1607954114 hasConceptScore W1607954114C119217923 @default.
- W1607954114 hasConceptScore W1607954114C119477230 @default.
- W1607954114 hasConceptScore W1607954114C127313418 @default.
- W1607954114 hasConceptScore W1607954114C154200439 @default.
- W1607954114 hasConceptScore W1607954114C165205528 @default.
- W1607954114 hasConceptScore W1607954114C166957645 @default.
- W1607954114 hasConceptScore W1607954114C205649164 @default.
- W1607954114 hasConceptScore W1607954114C2909236549 @default.
- W1607954114 hasConceptScore W1607954114C58097730 @default.
- W1607954114 hasConceptScore W1607954114C63379926 @default.
- W1607954114 hasConceptScore W1607954114C64174561 @default.
- W1607954114 hasConceptScore W1607954114C77928131 @default.
- W1607954114 hasConceptScore W1607954114C83176761 @default.
- W1607954114 hasConceptScore W1607954114C97490223 @default.
- W1607954114 hasLocation W16079541141 @default.
- W1607954114 hasOpenAccess W1607954114 @default.
- W1607954114 hasPrimaryLocation W16079541141 @default.