南沙地块OBS2019-2测线数据处理与震相识别*

doi:10.11978/2021162

Abstract

Abstract:

The survey of OBS2019-2 line was carried out across the continent-ocean transition zone (COT) near the Liyuexi Trough of the Nansha Block. This work is critical as it is able to reveal the crustal structure and study rifting-breakup mechanism of the southern continental margin of the South China Sea (SCS). The data of OBS2019-2 is also important to make a comparative study of conjugate continental margin of SCS. Compared with the northern continental margin, there is fewer Ocean Bottom Seismometer (OBS) survey lines and deep crustal structure study in the southern continental margin of SCS. Therefore, more work needs to be done on OBS2019-2. This paper focuses on the data processing workflow of OBS2019-2, including UKOOA file preparation, data format conversion, position relocation, single station seismic record section drawing, etc. Then different kinds of deep seismic phases (e.g. Pg, PcP, PmP, Pn) are identified and traced. These seismic phases are subsequently verified by the travel-time calculation using Rayinvr software. The results of data processing show that deep seismic phases in the seismic record profiles are distinct. The farthest seismic phase could be continuously traced up to 120 km away. Seismic data of OBS2019-2 are of high quality, which can provide a solid foundation for subsequent velocity modeling and structural interpretation.

Key words: Nansha Block, ocean bottom seismometer (OBS), crustal structure, data processing, seismic phase identification

CLC Number:

P712.83

GUO Jian, QIU Xuelin, LI Zizheng, HUANG Haibo. Data processing and phase identification of OBS2019-2 in Nansha Block*[J].Journal of Tropical Oceanography, 2022, 41(5): 43-56.

Figures/Tables 10

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Tab. 1

OBS relocation results of OBS2019-2"

站位编号	OBS 编号	投放点位置		校正后位置		校正后水深/m	RMS/ms	t_adjust/s
站位编号	OBS 编号	经度/E	纬度/N	经度/E	纬度/N	校正后水深/m	RMS/ms	t_adjust/s
01	A37	115°05′35.48″	12°49′05.95″	115°05′40.02″	12°49′06.31″	4360	2.6	-3.033
02	L26	115°07′43.72″	12°44′24.97″	115°07′51.46″	12°44′28.46″	4361	1.3	-0.144
03	S11	115°09′51.84″	12°39′43.92″	115°09′46.73″	12°39′40.97″	4363	1.8	-0.117
04	L23	115°12′00.40″	12°35′03.62″	115°11′48.66″	12°34′58.58″	4358	3.4	-0.124
05	L85	115°14′07.84″	12°30′21.82″	115°14′09.71″	12°30′20.84″	4360	1.2	-1.157
06	B41	115°16′15.74″	12°25′40.76″	115°16′11.39″	12°25′40.58″	4357	1.4	-0.011
07	L54	115°18′23.54″	12°20′59.68″	115°18′19.80″	12°20′59.53″	4359	1.5	-0.144
08	L16	115°20′31.31″	12°16′18.55″	115°20′44.09″	12°16′24.71″	4357	1.9	-0.126
09	H56	115°22′38.96″	12°11′37.43″	115°22′24.17″	12°11′32.75″	4357	1.5	-0.108
10	L17	115°24′46.55″	12°06′56.30″	115°24′48.20″	12°07′00.08″	4359	1.9	-0.130
11	B29	115°26′54.06″	12°02′15.14″	115°26′31.38″	12°02′07.55″	4369	3.1	-2.928
12	L94	115°29′01.50″	11°57′33.95″	115°28′58.40″	11°57′33.95″	4326	0.7	-1.115
13	L96	115°31′08.87″	11°52′52.75″	115°31′09.48″	11°52′54.84″	4328	2.2	-0.111
14	L93	115°33′16.16″	11°48′11.56″	115°33′22.93″	11°48′14.18″	4321	1.7	-0.122
15	L35	115°35′23.39″	11°43′30.32″	115°35′12.37″	11°43′25.46″	4332	2.0	-0.028
17	B87	115°39′37.62″	11°34′07.86″	115°39′22.03″	11°34′00.05″	4070	2.3	-0.027
18	L70	115°41′45.31″	11°29′27.67″	115°41′31.38″	11°29′21.12″	3936	1.4	-0.115
19	L98	115°43′51.56″	11°24′45.29″	115°44′03.70″	11°24′49.57″	3104	3.3	-0.076
20	L95	115°45′58.43″	11°20′03.98″	115°45′38.92″	11°19′55.81″	2700	1.8	-0.093
23	B40	115°52′18.59″	11°05′60.00″	115°52′18.84″	11°06′00.07″	2142	4.2	0.039
24	L31	115°54′25.20″	11°01′18.66″	115°53′52.12″	11°01′04.76″	2675	5.2	-2.093
25	L64	115°56′31.70″	10°56′37.28″	115°56′36.89″	10°56′40.06″	2350	5.5	-0.099
27	D28	116°00′44.57″	10°47′14.50″	116°00′43.31″	10°47′14.32″	2114	3.1	-0.192
28	L89	116°02′50.89″	12°49′05.95″	116°02′50.82″	10°42′33.16″	2228	3.5	-1.893
29	H52	116°04′57.14″	12°44′24.97″	116°04′43.25″	10°37′45.48″	2103	2.1	0.068
30	L99	116°07′03.07″	12°39′43.92″	116°07′02.82″	10°33′09.86″	1794	3.9	0.054

Tab. 1

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Fig. 9

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Data processing and phase identification of OBS2019-2 in Nansha Block*

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[15]	CAO Jing-he, XIA Shao-hong, SUN Jin-long, ZHU Jun-jiang, XU Hui-long. Preliminary results of onshore-offshore seismic experiments in a potential strong earthquake area off the Pearl River Estuary [J]. Journal of Tropical Oceanography, 2012, 31(3): 71-78.