Where a major earthquake has happened in the past, but not in a while, is called a seismic
a)gap
b)wave
C)fault
d)scale
Please note the spelling of SCIENCE.
Check this site.
http://sepwww.stanford.edu/oldsep/joe/fault_images/lpgap.html
The correct answer is a) gap.
To determine the answer, we need to understand the terms and concepts related to earthquakes.
A major earthquake occurs when there is a release of energy in the Earth's crust, resulting in ground shaking. These earthquakes often occur along faults, which are fractures or cracks in the Earth's crust along which movement has occurred or is potentially expected.
Now, in areas where significant earthquakes have occurred in the past, but there hasn't been any seismic activity for a while, it is referred to as a "seismic gap." Seismic gaps are regions along faults where stress has been building up, but no major earthquakes have occurred to release that built-up energy.
By understanding the concept of seismic gaps, we can conclude that the correct answer to the question is a) gap.