###### Abstract
The application of shallow geophysical investigation in landslide studies is traditionally related to: (i) seismic methods, such as refraction and passive techniques, from the investigation of the transmission velocity of elastic waves (\(V_{p}\) and \(V_{s}\)), and provide information on materials' characteristics, geometry, and 2D distribution and can yield some geotechnical-related parameters such a density, compaction, and elastic dynamic modulus; active and passive techniques can define the whole geology, the differentiation between sediments and the basement, and even the sliding surface [3; 4; 5]; (ii) electrical methods, such as Vertical Electrical Soundings (VES) and tomography, are the most employed geophysical surveys in soft soils landslides investigation; they are used to define the position of the phreatic levels (humidity and presence of aquifers levels) and also to draw its internal structure, faults and fractures, and stratigraphic relationships; research related to the measurement of resistivity changes allows for defining the area's stratigraphy (separation of material layers) and the presence of humidity and water (even degree of saturation) in the geological levels. Furthermore, 2D techniques such as tomography allow for obtaining and defining structures (faults and joints) and geometric relationships between materials [4; 5; 6]; (iii) others include electromagnetic (EM) techniques such as Ground Penetrating Radar (GPR) [3; 4; 5; 6]. The GPR is important for studying the shallow characteristics of materials, but its capability to get some in-depth information is limited [3; 4; 5; 6]. The combination of these techniques, involving direct investigations as dill holes, makes it possible to define and study the geometry of a landslide and, on occasion, to establish its rupture surface [5; 6]. Moreover, passive seismic techniques have recently begun to be broadly applied in ground investigation, such as multispectral seismic and spectral analysis of components and are combined with other methods transported by drones (UAV) or even interferometric techniques [3]. Therefore, Multichannel Analysis of Surface Waves (MASW) and Horizontal to Vertical Strictal Ratio (HVSR) techniques have started to be more useful in landslide studies [4; 7; 8; 9; 10; 11; 12; 13]. The research objective has been to study an area in the process of landslide in an initial phase, which involves determining a fast and effective enough amount of information that allows for both the proposal of methods of remediation or mitigation in this phenomenon. This early geophysical campaign was designed to obtain previous knowledge about the size and depth of this landslide in order to study it entirely and in in-depth in the future. It will be the basis for defining where and how deep drilling bore-holes can be. This initial data could be capable of establishing advanced research criteria for the landslide, such as the location of drill holes or even a new advanced geophysical campaign. The geophysical research investigation proposed must be reliable, easy to perform, and give some accuracy in interpretation models. The methodology used in this research combined the application of two geophysical methods: seismic and geoelectrical. Refraction and MASW techniques were applied (as active profile ones), and the HVSR passive technique from the first method was used as was the VES technique of the geoelectrical method. The results obtained from applying refraction and MASW seismic techniques will allow for obtaining velocity values of the compressional (P) and shear (S) waves, respectively, which will be used in defining the characteristics of shallow and probably moving materials [5; 14]. It also can provide a two-dimensional view of the geometry of shallow layers and identify the separation between soft materials (moving sediments) and hard rock (considered fixed).