This chapter thoroughly examines the significance of seismic waves and focal mechanisms in comprehending earthquakes, with specific emphasis on the Eastern Mediterranean region. The text explores the methodology employed by seismologists to utilize the timing, amplitude, and frequency of seismic waves to ascertain the precise location and magnitude of earthquakes. The chapter highlights the significance of focal mechanisms mathematical models that illustrate the forces applied to a fault and forecast the motion pattern that would generate the observed seismic waves. The chapter delves deeper into using sophisticated techniques, such as moment tensor inversion and waveform modeling, to extract crucial details about the earthquake source. The text emphasizes the complex interplay between regional stress fields, fault behavior, and subduction processes in the Eastern Mediterranean, a region known for its extensive and diverse tectonic activity. The writers analyze the catastrophic earthquake in Gaziantep, Turkiye, in 2023, causing significant loss of life and severe economic damage. The essay elucidates how the African plate undergoes subduction beneath the Eurasian and Arabian plates, resulting in seismic activity in the region. The chapter concludes by emphasizing the need for more research to enhance seismic hazard assessments and preparedness methods in the Eastern Mediterranean. The article proposes expanding the geographic coverage of the seismic networks, improving the precision of the collected data, utilizing modern modeling techniques, and integrating data from other disciplines to comprehensively comprehend the origins of earthquakes and their relationship to tectonic features. It is anticipated to foster a future characterized by enhanced security and resilience in the region.