CANBERRA, Jan. 22 (Xinhua) -- Australian and Chinese scientists have made a breakthrough in solving the mystery of how the landscape of Mars evolved over billions of years.

Now a network of seismographs spans the country, measuring the initial P-waves when an earthquake strikes. Agency computers collate the data and almost instantaneously issue estimates of its size ...

Usually, the tremors measuring 2.5 or less on the Richter scale are not felt but can be recorded by a seismograph, according to experts. Worldwide millions of minor earthquakes are recorded every year ...