Application of Electrical Resistivity Tomography (ERT) in the investigation ofQuaternary land slide zones, based on the selected regions of Płock slope

The article shows the results of geophysical surveys performed by using Electrical Resistivity Tomography (ERT) method on se lected ragion of P³ock slope of a Tumski hill near Ba sil ica of As sump tion of the Blessed Vir gin Mary in P³ock and in Maszewo by the Vistula River a few ki lo me ters north of P³ock. The above-men tioned sec tions were se - lected due to land slide phe nom ena ob served there. Geo phys i cal sur veys were con ducted in or der to ver ify the state of the dis tri bu tion of elec tri cal re sis tiv ity in the sec tors where mass move ment was iden ti fied. The electrofusion crosssec tion near Ca the dral Ba sil ica shows clays and sands. Also in ERT prospection a zone of loose soils with high re sis - tance is clearly vis i ble. The re sults of the ERT method from Maszewo, in di cates his tor i cal land sur face of a land slide and that the slope in Maszewo con sists of co he sive de pos its. In or der to de scribe these par tic u lar is sues, geo log i cal cross-sec tions and safety fac tor ob tained by cal cu la tion are pre sented for the an a lyzed parts of the slope. The safety factor shows that prob a bil ity of land slide ac tiv ity near Ca the dral Ba sil ica is very un likely and in Maszewo is very high.