There Change the design of the studying process in University during the covid-19 pandemic from face to face to online learning needs some tools to support it. Some tools coming with their own advantages and disadvantages. One of them is Zoom. It becoming tools liked by many lecturers and college students because easy installation process and complete features although it is not free and easy to hack. Nevertheless, internet access is still becoming a big problem in online learning. A mix between two tools of online learning is one of the solutions, for example, zoom and google classroom application. Zoom is used for virtual communication in online learning but it does not provide features for sending the assignment. Otherwise, google classroom provides features to send and receipt some assignments, and it can save the quote on the internet. Both of them will complete each other to support all needs in online learning.

In July 2018, Lombok Island in Indonesia shaked by earthquake of Flores Fault. The earthquake is felt in surounding Lombok like Bali. There are two major earthquake source in Lombok, they are Flores fault in the north, and subduction zone in the south. There are more than 300 fatalities of human, and more than 270.000 refugees. The government of Indonesia established that Lombok Earthquake was a national disaster. This research is aimed to describe how the subduction zone around Lombok both it come two major of earthquake source and to answer the rumor is the earthquake affect Rinjani vulcano in Lombok activity or not.

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Signal Analysis is a part of geophysics work. It is important in analyse the character of signal or waveform in geophysics. In this paper the earthquake waveform is used as the example. One method to do this is used Short Time Fourier Transform. It adopts the basic concept of Fast Fourier Transform in the short period of time in waveform and at the same moment there is a convolutional process between the waveform and the mother wavelet and then resulting the spectrogram. Finally, the spectrogram will show the power spectrum or the magnitude of the amplitude in each time in the waveform. It relates with the energy of the earthquake. The result including three parameters, they are time, frequency and the spectrogram. It makes easier for the geophysicist to analyse the frequency changing in each time based on the spectrogram colour. Besides that, it can be used to identify the arrival time of P and S wave as the important information in calculate the hypocentre location of the earthquake.