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利用浅层地震勘探资料和钻探资料,揭示出宁波育王山山前隐伏断层的存在.8条浅层地震勘探剖面资料显示,育王山山前隐伏断层距山前600～1 200m,断错盆地基底面,可能向上延伸到盆地底部的第四纪地层中.用光释光测年和孢粉分析方法,对钱家钻孔中的第四纪地层进行了年代确定,认为大楔盆地西缘盆地内的第四纪地层为晚更新世以来的堆积.钻探资料显示,钱家和岭南钻孔组中均揭露出侏罗纪凝灰岩中的断层破碎带和断层面.其中,钱家钻孔联合剖面中断层破碎带宽8.5m,岭南钻孔联合地质剖面中发现2条断层,其中一条断层的破碎带宽5m.岭南DQZK6孔埋深35m的上更新统下段黏土中断层面倾角70°,擦痕近垂直;钱家QJZK8孔中,埋深约35m的黏土层中断层面倾角也为70°.断层晚更新世早期的垂直活动速率为0.034～0.046mm/a,属于晚更新世早期弱活动断层.上断点埋深约35m,断层的错动不会对地面建筑物形成直接破坏.
The shallow seismic data and drilling data reveal the existence of hidden fault in front of Yushan Mountain in Ningbo.The data of 8 shallow seismic exploration sections show that the buried fault in front of Yushan Mountain is 600-1 200m from Piedmont, May extend up to Quaternary strata at the bottom of the basin.The dating of quaternary strata in Qianjia hole was determined by optical luminescence dating and sporopollen analysis, Quaternary strata have been deposited since the late Pleistocene.The drilling data show that both the Qianjia and Lingnan borehole groups revealed faults and fault planes in the Jurassic tuff.Among them, Broken bandwidth of 8.5m, Lingnan drilling joint geological section found two faults, one of the fault broken bandwidth of 5m. Lingnan DQZK6 hole depth of 35m of the Upper Pleistocene clay fault surface dip angle of 70 °, nearly vertical scratches; Qian In the QJZK8 hole, the dip angle of the fault in the clay layer with a buried depth of 35m is also 70 °. The vertical active rate of the Late Pleistocene in the fault was 0.034 ~ 0.046mm / a, belonging to the weak active fault in the early Pleistocene. About 35m, fault fault Not in direct damage to the building ground.