from obspy.core import read
import matplotlib.pyplot as plt

SEC = 20
SPS = 250

while 1:
    st = read('file1.mseed')

    plt.figure(1)
    plt.cla()
    plt.plot(st.traces[0].data[-(SEC*SPS):], 'b')
    plt.show(block=False)
    plt.pause(1)