共查询到20条相似文献，搜索用时 180 毫秒
1.
1999年青海省三次5级以上地震震源机制 总被引：2，自引：0，他引：2
1999年 5月 30日、9月 2 7日、11月 2 6日分别在青海省的唐古拉 (32°5 1′N,93°34′E)、河南县 (34 .6°N,10 1.4°E)和玛沁 (34°30′N,99°48′E)发生 5 .6、5 .1和 5 .0级地震。震后收集了青海省地震台网、甘肃省地震台网和全国基准台网的部分 P波初动符号 ,做出震源机制及其参数见下表和图 1。参 数 A节面 B节面 P轴 T轴 N轴倾向倾角倾向倾角走向倾角走向倾角走向倾角唐古拉 5.6 2 2 3° 76° 6 1° 16° 4 8° 35° 2 15° 6 5° 30 8° 8°河南县 5.12 81° 4 7° 10 5° 4 3° 2 83° 2° 14 7° 87° 13° 2°玛沁 5.0 2 74… 相似文献
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序号发震时间地震位置月日时分秒北纬东经地点震级(ML)深度(km)精度1110161859.542°01′122°49′辽宁省新民3.212Ⅰ2122203158.548°10′130°34′黑龙江省罗北3.210Ⅱ3123074112.937°41′119°38′渤海3.6Ⅱ4124202243.751°49′122°56′黑龙江省大兴安岭呼中5.18Ⅱ5126110105.639°22′122°13′辽宁省普兰店3.211Ⅰ6128140731.739°40′123°45′北黄海3.2Ⅱ729183204.640°41′122°41′辽宁省海城3.09Ⅰ8223161241.147°41′124°42′黑龙江省富裕4.24Ⅰ932065156.251°32′123°04′黑龙江省大兴安岭呼中3.07Ⅱ东北地区2005年第… 相似文献
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发 震 时 间震 中 位 置月-日T时:分:秒φN/(°)(′)λN/(°)(′)地 点震 级ML深 度h/km精 度台数备 注02-19T20:36:03.738°46′112°52′原平市3.051502-28T12:43:38.636°35′113°20′黎城县3.0121503-4T16:30:53.036°41′113°23′黎城县3.41411103-13T01:32:45.836°29′112°17′沁源县3.4101603-18T14:24:46.939°55′113°53′阳高县3.1101506-11T18:55:16.339°51′113°49′浑源县3.4111508-18T07:35:20.040°03′112°35′右玉县3.024塌陷08-26T20:30:31.639°53′113°37′大同县3.024塌陷09-19T03:39… 相似文献
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利用P波初动和直达P、S波最大速度振幅比联合求解小震震源机制的方法求出珊溪水库ML2.0以上地震的震源机制,得到了珊溪水库震源机制各参数时空特征如下:主压应力为SN向,主张应力为EW向,应力主要为水平应力,发震断层倾角较大且多为走滑断层。在个别4级左右地震前P轴方位都有偏离再恢复的现象。在北纬27.65°～27.69°间,P轴方位集中在0°±30°或者180°±30°,节面走向集中在45°±15°或者135°±15°。震源深度大于4km的地震倾角多集中在70°～90°度之间。 相似文献
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序号发震时间地震位置月日时分秒北纬东经地点震级(ML)深度(km)精度1 6 26 05 13 08·8 45°20′124°45′吉林松原3·2Ⅰ2 7 25 23 43 33·9 46°59′125°03′黑龙江林甸5·5 5Ⅰ3 7 25 23 54 01·9 47°01′124°58′黑龙江林甸3·1 4Ⅰ4 7 25 23 57 12·4 46°59′125°05′黑龙江林甸3·7 5Ⅰ5 7 26 04 55 52·7 46°58′125°04′黑龙江林甸3·2 5Ⅰ6 7 26 05 13 12·5 45°34′124°46′黑龙江肇源3·1 10Ⅱ7 8 4 14 21 35·9 46°59′125°04′黑龙江林甸3·5 5Ⅰ8 8 14 17 59 32·1 51°41′123°05′黑龙江大兴安岭3·8 14Ⅱ9 9 … 相似文献
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据中国地震局台网测定 ,2 0 0 3年 1 2月1 0日 1 2时 38分 (北京时间 )在台湾地区( 2 3 1°N ,1 2 1 4°E)发生了MS=7 0地震。我们利用CDSN的 7个台站的数字波形资料初步反演了该地震的震源参数 ,结果如下 :最佳双力偶解 :节面Ⅰ走向 4 9°,倾角79° ,滑动角 1 6 6°;节面Ⅱ走向 1 4 2° ,倾角76° ,滑动角 1 1°。应力轴 :T轴方位 5° ,仰角 1 7° ;N轴方位 1 93°,仰角 72° ;P轴方位 96° ,仰角 2°。标量地震矩 :M0 =8.3× 1 0 19N·m。矩震级 :Mw =7.2。图 1 震源机制的几何表示2003年12月10日台湾7.0级地震震源参数@许力生$中… 相似文献
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The earthquakes(ML≥3·0)catalogue of Second quarter in northeastern area,2005序号发震时间地震位置月日时分秒北纬东经地点震级(ML)深度(km)精度1 4 4 20 18 29·1 42°02′123°10′辽宁新民3·1 7Ⅰ2 4 15 14 34 11·6 41°50′128°03′吉林抚松4Ⅰ3 5 5 10 11 16·0 39°05′121°28′金州湾3·3Ⅱ4 5 27 01 18 24·6 40°38′122°52′辽宁海城3·3 13Ⅰ5 6 25 11 13 47·0 47°40′130°32′黑龙江萝北3·2 5Ⅱ6 6 27 19 18 23·8 39°14′122°15′里长山海峡3Ⅱ东北地区2005年第二季度M_L≥3·0地震目录@梁灿
@温岩
… 相似文献
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《华南地震》2003,(3)
发震时间月日时分秒震 中 位 置 北纬东经地 点 震级 (ML)震源深度(km)0 4 0 5 0 9 12 35 6 2 3 4 5° 114 38°广东新丰江 3 4 70 4 0 6 0 7 0 1 39 5 2 2 4 9° 118 15°台湾海峡南部 3 40 4 0 6 11 5 5 31 4 2 2 4 9° 118 15°台湾海峡南部 3 10 4 0 7 2 1 38 37 32 0 2 6° 10 9 2 4°北部湾 3 0 70 4 2 8 13 4 4 0 9 0 2 4 0 4° 116 2 2°广东丰顺 3 170 5 0 1 15 2 3 18 4 2 1 5 7° 10 9 0 0°广西钦州 4 3190 5 15 2 0 33 2 2 4 2 3 0 7° 117 17°… 相似文献
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Michael O. Garcia Diane Hanano Ashton Flinders Dominique Weis Garrett Ito Mark D. Kurz 《Bulletin of Volcanology》2012,74(6):1445-1463
The size, shape, and magmatic history of the most recently discovered shield volcano in the Hawaiian Islands, Mahukona, have been controversial. Mahukona corresponds to what was thought to be a gap in the paired sequence (Loa and Kea trends) of younger Hawaiian volcanoes (<4?Ma). Here, we present the results of marine expeditions to Mahukona where new bathymetry, sidescan sonar, gravity data, and lava samples were collected to address these controversies. Modeling of bathymetric and gravity data indicate that Mahukona is one of the smallest Hawaiian volcanoes (～6,000?km3) and that its magmatic system was not focused in a long-lived central reservoir like most other Hawaiian volcanoes. This lack of a long-lived magmatic reservoir is reflected by the absence of a central residual gravity high and the random distribution of cones on Mahukona Volcano. Our reconstructed subsidence history for Mahukona suggests it grew to at least ～270?m below sea level but probably did not form an island. New 40Ar–39Ar plateau ages range from 350 to 654?ka providing temporal constraints for Mahukona’s post-shield and shield stages of volcanism, which ended prematurely. Mahukona post-shield lavas have high 3He/4He ratios (16–21?Ra), which have not been observed in post-shield lavas from other Hawaiian volcanoes. Lava compositions range widely at Mahukona, including Pb isotopic values that straddle the boundary between Kea and Loa sequences of volcanoes. The compositional diversity of Mahukona lavas may be related to its relatively small size (less extensive melting) and the absence of a central magma reservoir where magmas would have been homogenized. 相似文献
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In this study, we have checked the location and focal depth of the Yecheng earthquake (m b = 6.0, maximum intensity VII) of February 14, 1980. The result shows that this is an intermediate event with a focal depth of 90 km. The microepicenter is located at 36. 4°N, 76, 9°E, while the macroepicenter is at 37.3°N, 76.9°E, 90 km to the north of the microepicenter. This is the first destructive intermediate event in China which led to a damage as severe as of intensity VII. The focal mechanism of the event is determined to be of thrust type. Combined with the analysis of seismological and geological data in surrounding area, the possible relation between the event and plate movement has been discussed. The result in this paper indicates that in some particular place, the destructive effect of intermediate event should be considered in seismic hazard assessment. 相似文献
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Earthquake of November 30, 2004, in Podhale region, southern Poland, was of unexpectedly big size in this area of weak seismicity.
As Poland is considered a country of low seismicity, the earthquake has caused concern about seismic hazard in Poland, especially
since it took place shortly after the even more unexpected Kaliningrad Region, Russia, earthquakes of September 21, 2004,
that inflicted minor damage in northern Poland. The paper presents the findings on the Podhale earthquake which reached macroseismic
intensity up to 7 and magnitude 4.7 (m
b
; ISC). The event was felt up to a distance of about 100 km and inflicted slight damage to buildings in its narrow epicentral
area, thus evidencing its relatively shallow depth. The quake has been located near the village of Skrzypne, about 15 km west-southwest
of the district capital Nowy Targ. The source mechanism has been found to be of dip slip normal fault type, although a problem
remains of association of this mechanism with known tectonic dislocations in the region. The earthquake has been followed
by a long series of aftershocks. Their distribution in time is also studied and the biggest aftershocks have been located. 相似文献
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Drop calorimetry measurements between 900 and 1850 K are reported for amorphous anorthite, andesine, wollastonite, diopside, cordierite and pyrope. The isobaric heat capacities of the glassy and liquid phases of these materials, and the enthalpies of fusion of the minerals have been derived. The calorimetric entropies of fusion of these substances and of other oxide minerals are generally consistent with the calculated volume changes on melting and with the observed pressure dependences of the melting points. The thermodynamics of mixing of liquid plagioclases have been examined, and it is concluded that their enthalpies of mixing are markedly different from the values derived directly from solution calorimetry measurements at 985 K. 相似文献
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In this study, we experimentally established the relationship between physical properties, vitrinite reflectance, and microstructure of coal, Taiyuan Formation, Qinshui Basin, China using representative coal samples collected from three different mines via the rock mechanics testing system (MTS). We analyzed the organic macerals, vitrinite reflectance, and microstructure of 11 coal samples using petrography and scanning electron microscopy (SEM). The experimental results suggest that (1) the elastic parameters can be described by linear equations, (2) both P-and S-wave velocities display anisotropy, (3) the anisotropy negatively correlates with vitrinite reflectance, and (4) the acoustic velocities and Young’s modulus are negatively correlated with the volume of micropores. The derived empirical equations can be used in the forward modeling and seismic inversion of physical properties of coal for improving the coal-bed methane (CBM) reservoir characterization. 相似文献
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The distribution of Ti, Zr, Y, Sr, K, P and Nb has been investigated at 55 sample sites within a single basaltic flow, the Cliefden Outcrop, which has adjusted to low-grade metamorphism of the prehnite-pumpellyite facies. The cluster of points in the plot of Ti, Zr and Y as proposed by Pearce and Cann shows that the ratio of these elements has remained relatively constant after metamorphism and would therefore have significance in attempts at classification of magma type. Likewise a plot involving Nb, Y, Zr and P as proposed by Floyd and Winchester shows only restricted scatter and appears useful. However, plots involving Sr or K show a scatter that is clearly related to metamorphic processes. Consequently, plots involving these two elements are likely to be of little use in classification in this case.Low-grade metamorphism is common, variable and not always recognized. The study concerned one style of alteration and revealed problems in the application of some classification schemes. Consequently it is apparent that much more rigorous testing is needed before classification schemes can be generally applied to sequences of basaltic rocks. 相似文献
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Facets of uncertainty: epistemic uncertainty,non-stationarity,likelihood, hypothesis testing,and communication 总被引：1，自引：1，他引：0
Keith Beven 《水文科学杂志》2016,61(9):1652-1665
ABSTRACTThis paper presents a discussion of some of the issues associated with the multiple sources of uncertainty and non-stationarity in the analysis and modelling of hydrological systems. Different forms of aleatory, epistemic, semantic, and ontological uncertainty are defined. The potential for epistemic uncertainties to induce disinformation in calibration data and arbitrary non-stationarities in model error characteristics, and surprises in predicting the future, are discussed in the context of other forms of non-stationarity. It is suggested that a condition tree is used to be explicit about the assumptions that underlie any assessment of uncertainty. This also provides an audit trail for providing evidence to decision makers.
Editor D. Koutsoyiannis; Associate editor S. Weijs 相似文献