Slow slip is one of the mechanisms of relaxation of tectonic stresses in the Earth's crust. It has been recorded in seismically active zones over the Earth, and it is accompanied by low-frequency and very low-frequency earthquakes. The paper presents modern concept about the physics of slow slip and examines the spatiotemporal linking slow slip and ordinary earthquakes. The discovery of slow slip phenomenon has revolutionized our understanding of the physics of deformation processes occurring in the Earth's crust and motivates us to develop a two-stage model of earthquake nucleation—initiation at the first stage of slow slip, which at the second stage transforms into rapid rupture.

Typically, an English full text is available in about 1 month from the date of publication of the original article.

Keywords: tectonic fault, slow earthquakes, asperity, frictional stability PACS: 91.30.Px DOI: 10.3367/UFNe.2025.11.040061 URL: https://ufn.ru/en/articles/2026/2/d/ Citation: Ostapchuk A A "Slow slip on tectonic faults" Phys. Usp. 69 (2) (2026) Received: 14th, July 2025, revised: 6th, November 2025, accepted: 11th, November 2025 Оригинал: Остапчук А А «Медленное скольжение по тектоническим разломам» УФН 196 173–181 (2026); DOI: 10.3367/UFNr.2025.11.040061