Slurry type heavy calcium carbonate of added porcelain clay for making paper and its preparing method

Broadband ocean bottom seismograph

The invention discloses a broadband ocean bottom seismograph comprising two protecting shells and a connecting plate, wherein the two protecting shells are respectively fixed on both ends of the connecting plate; a sealed instrument storehouse ball and a sealed battery storehouse ball are respectively installed in the two protecting shells; a battery and an acoustic communication circuit are installed in the battery storehouse ball; two sealed storehouse balls are electrically connected by a cable; a gimbal for keeping the seismograph in a level state is arranged in the instrument storehouse ball and provided with a data collector and a seismograph; an electro erosion releasing mechanism for releasing a coupling frame is fixed on the connecting plate; the coupling frame for supplying downforces for the seismograph is positioned below the connecting plate and connected with the electro erosion releasing mechanism by wire ropes; and a weighting frame is connected below the coupling frame ...