Citation:

PANGAEA.913797

Name: Shallow seismicity and the classification of structures in the Lau back-arc basin
Published: 2020-03-20
License: https://creativecommons.org/licenses/by/4.0/
Keywords: back-arc basins; CMTs; earthquake; Lau Basin; seismicity

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Abstract:

We compared Centroid Moment Tensors (CMTs), calculated for large (Mw >5), shallow (<30 km) seismic events to the orientations of seafloor lineaments (n = 4000) mapped throughout the Lau Basin, in the SW Pacific. Ship-based multibeam was combined with vertical gravity gradient data to provide comprehensive coverage to create the lineament map. By comparing the possible focal planes of the CMTs to the orientations of the lineaments, the most likely fault plane solutions were selected, thus classifying the faults and establishing the nature of the highly variable stress regimes in the basin. We resolved the strike, dip and dip direction of 308 faults, and classified 258 additional structures by fault type. The majority of the table was data downloaded from the Global Centroid Moment Tensor (GCMT) database (www.globalcmt.org: accessed October 2018). For more details about the column headers consult the GCMT database website. New data from this study include the latitude and longitude error estimates (in meters), the classified faults (column: 'fault_type'), and the stress domain (column: 'stress_domain'), allocated to each of the classified faults.

Keyword(s):

back-arc basins; CMTs; earthquake; Lau Basin; seismicity

Supplement to:

Baxter, Alan T; Hannington, Mark D; Stewart, Margaret S; Emberley, Justin M; Breker, Kaitlyn; Krätschell, Anna; Petersen, S; Brandl, Philipp A; Klischies, Meike; Mensing, Rebecca; Anderson, Melissa O (accepted): Shallow seismicity and the classification of structures in the Lau back-arc basin. Geochemistry, Geophysics, Geosystems, https://doi.org/10.1029/2020GC008924

Related to:

Dziewonski, A M; Chou, T-A; Woodhouse, J H (1981): Determination of earthquake source parameters from waveform data for studies of global and regional seismicity. Journal of Geophysical Research: Solid Earth, 86(B4), 2825-2852, https://doi.org/10.1029/JB086iB04p02825

Ekström, G; Nettles, M; Dziewonski, A M (2012): The global CMT project 2004–2010: Centroid-moment tensors for 13,017 earthquakes. Physics of The Earth and Planetary Interiors, 200-201, 1-9, https://doi.org/10.1016/j.pepi.2012.04.002

Source:

Ekström, G; Nettles, M: Global CMT database - download from October 2018. Lamont-Doherty Earth Observatory of Colombia University, New York, https://www.globalcmt.org

Project(s):

Global Centroid Moment Tensor Project (GCMT)

Funding:

National Science Foundation (NSF), grant/award no. 0824694 : Global Centroid Moment Tensor Project / EAR-16-39131

Coverage:

Median Latitude: -17.075910 * Median Longitude: -176.131561 * South-bound Latitude: -26.600000 * West-bound Longitude: -179.990000 * North-bound Latitude: -14.000000 * East-bound Longitude: -173.140000

Date/Time Start: 1977-01-17T00:04:38 * Date/Time End: 2017-12-16T00:05:40

Event(s):

B010186B * Latitude: -17.810000 * Longitude: -174.430000 * Date/Time: 1986-01-01T00:39:21

B010285E * Latitude: -14.640000 * Longitude: -175.370000 * Date/Time: 1985-01-02T00:29:27

B010484C * Latitude: -15.190000 * Longitude: -174.620000 * Date/Time: 1984-01-04T00:00:11

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	Event label	Event		Baxter, Alan T	source: Global Centroid Moment Tensor Database
2	LONGITUDE	Longitude		Baxter, Alan T	Geocode – source: Global Centroid Moment Tensor Database
3	Longitude, error	Longitude e		Baxter, Alan T	source: Global Centroid Moment Tensor Database
4	LATITUDE	Latitude		Baxter, Alan T	Geocode – source: Global Centroid Moment Tensor Database
5	Latitude, error	Latitude e		Baxter, Alan T	source: Global Centroid Moment Tensor Database
6	Coordinate uncertainty	Coord unc	m	Baxter, Alan T	Latitude error, 1rad error
7	Coordinate uncertainty	Coord unc	m	Baxter, Alan T	Longitude error, 1rad error
8	Coordinate uncertainty	Coord unc	m	Baxter, Alan T	Latitude error, 2rad error
9	Coordinate uncertainty	Coord unc	m	Baxter, Alan T	Longitude error, 2rad error
10	Hypocentre depth	HCD	km	Baxter, Alan T	source: Global Centroid Moment Tensor Database
11	Hypocentre depth, error	HCD err	km	Baxter, Alan T	source: Global Centroid Moment Tensor Database
12	DATE/TIME	Date/Time		Baxter, Alan T	Geocode – source: Global Centroid Moment Tensor Database
13	Time, standard error	Time std e	±	Baxter, Alan T	source: Global Centroid Moment Tensor Database
14	Moment magnitude	Mw		Baxter, Alan T
15	Surface wave magnitude	Ms		Baxter, Alan T	source: Global Centroid Moment Tensor Database
16	Body wave magnitude	mb		Baxter, Alan T	source: Global Centroid Moment Tensor Database
17	Strike	Strike	deg	Baxter, Alan T	Strike1; source: Global Centroid Moment Tensor Database
18	Dip	Dip	deg	Baxter, Alan T	Dip1; source: Global Centroid Moment Tensor Database
19	Rake	Rake	deg	Baxter, Alan T	Rake1; source: Global Centroid Moment Tensor Database
20	Strike	Strike	deg	Baxter, Alan T	Strike2; source: Global Centroid Moment Tensor Database
21	Dip	Dip	deg	Baxter, Alan T	Dip2; source: Global Centroid Moment Tensor Database
22	Rake	Rake	deg	Baxter, Alan T	Rake2; source: Global Centroid Moment Tensor Database
23	Moment tensor Mrr	Mrr	10¹⁸ dyn*cm	Baxter, Alan T	source: Global Centroid Moment Tensor Database
24	Moment tensor Mtt	Mtt	10¹⁸ dyn*cm	Baxter, Alan T	source: Global Centroid Moment Tensor Database
25	Moment tensor Mpp	Mpp	10¹⁸ dyn*cm	Baxter, Alan T	source: Global Centroid Moment Tensor Database
26	Moment tensor Mrt	Mrt	10¹⁸ dyn*cm	Baxter, Alan T	source: Global Centroid Moment Tensor Database
27	Moment tensor Mrp	Mrp	10¹⁸ dyn*cm	Baxter, Alan T	source: Global Centroid Moment Tensor Database
28	Moment tensor Mtp	Mtp	10¹⁸ dyn*cm	Baxter, Alan T	source: Global Centroid Moment Tensor Database
29	Moment tensor Mrr, error	Mrr e	±	Baxter, Alan T	source: Global Centroid Moment Tensor Database
30	Moment tensor Mtt, error	Mtt e	±	Baxter, Alan T	source: Global Centroid Moment Tensor Database
31	Moment tensor Mpp, error	Mpp e	±	Baxter, Alan T	source: Global Centroid Moment Tensor Database
32	Moment tensor Mrt, error	Mrt e	±	Baxter, Alan T	source: Global Centroid Moment Tensor Database
33	Moment tensor Mrp, error	Mrp e	±	Baxter, Alan T	source: Global Centroid Moment Tensor Database
34	Moment tensor Mtp, error	Mtp e	±	Baxter, Alan T	source: Global Centroid Moment Tensor Database
35	Scalar moment	Sc M	10¹⁸ dyn*cm	Baxter, Alan T	source: Global Centroid Moment Tensor Database
36	Principle axis, T	Pa T	10¹⁸ dyn*cm	Baxter, Alan T	source: Global Centroid Moment Tensor Database
37	Principle axis, T, azimuth	Pa T azim	deg	Baxter, Alan T	source: Global Centroid Moment Tensor Database
38	Principle axis, T, plunge	Pa T plunge	deg	Baxter, Alan T	source: Global Centroid Moment Tensor Database
39	Principle axis, N	Pa N	10¹⁸ dyn*cm	Baxter, Alan T	source: Global Centroid Moment Tensor Database
40	Principle axis, N, azimuth	Pa N azim	deg	Baxter, Alan T	source: Global Centroid Moment Tensor Database
41	Principle axis, N, plunge	Pa N plunge	deg	Baxter, Alan T	source: Global Centroid Moment Tensor Database
42	Principle axis, P	Pa P	10¹⁸ dyn*cm	Baxter, Alan T	source: Global Centroid Moment Tensor Database
43	Principle axis, P, azimuth	Pa P azim	deg	Baxter, Alan T	source: Global Centroid Moment Tensor Database
44	Principle axis, P, plunge	Pa P plunge	deg	Baxter, Alan T	source: Global Centroid Moment Tensor Database
45	Longitude 2	Longitude 2		Baxter, Alan T	Reference; source: Global Centroid Moment Tensor Database
46	Latitude 2	Latitude 2		Baxter, Alan T	Reference; source: Global Centroid Moment Tensor Database
47	Hypocentre depth	HCD	km	Baxter, Alan T	Reference; source: Global Centroid Moment Tensor Database
48	DATE/TIME	Date/Time		Baxter, Alan T	Geocode – Date/time reference; source: Global Centroid Moment Tensor Database
49	DATE/TIME	Date/Time		Baxter, Alan T	Geocode – Date/time Reference 2; source: Global Centroid Moment Tensor Database
50	Body waves, stations	Bw s	#	Baxter, Alan T	source: Global Centroid Moment Tensor Database
51	Body waves, components	Bw c	#	Baxter, Alan T	source: Global Centroid Moment Tensor Database
52	Body waves, shortest period	Bw p	s	Baxter, Alan T	source: Global Centroid Moment Tensor Database
53	Surface waves, stations	Sw s	#	Baxter, Alan T	source: Global Centroid Moment Tensor Database
54	Surface, components	Sw c	#	Baxter, Alan T	source: Global Centroid Moment Tensor Database
55	Surface waves, shortest period	Sw p	s	Baxter, Alan T	source: Global Centroid Moment Tensor Database
56	Mantle waves, stations	Mw s	#	Baxter, Alan T	source: Global Centroid Moment Tensor Database
57	Mantle waves, components	Mw c	#	Baxter, Alan T	source: Global Centroid Moment Tensor Database
58	Mantle waves, shortest period	Mw p	s	Baxter, Alan T	source: Global Centroid Moment Tensor Database
59	Comment	Comment		Baxter, Alan T	Centroid moment tensor version; source: Global Centroid Moment Tensor Database
60	Type	Type		Baxter, Alan T	Centroid moment tensor type; source: Global Centroid Moment Tensor Database
61	Comment	Comment		Baxter, Alan T	Depth inversion; source: Global Centroid Moment Tensor Database
62	Location	Location		Baxter, Alan T	Geographic location; source: Global Centroid Moment Tensor Database
63	Location	Location		Baxter, Alan T	Hypocenter; source: Global Centroid Moment Tensor Database
64	Time Stamp	Time Stamp		Baxter, Alan T	Centroid moment tensor time stamp; source: Global Centroid Moment Tensor Database
65	Comment	Comment		Baxter, Alan T	Moment rat; source: Global Centroid Moment Tensor Database
66	Comment	Comment		Baxter, Alan T	Moment r1; source: Global Centroid Moment Tensor Database
67	Comment	Comment		Baxter, Alan T	Focal mechanism; source: Global Centroid Moment Tensor Database
68	Type	Type		Baxter, Alan T	Fault type
69	Area/locality	Area		Baxter, Alan T	Stress domain

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Size:

42372 data points

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