GNGTS 2017 - 36° Convegno Nazionale

52 GNGTS 2017 S essione 1.1 Other data. Natural emissions of hydrocarbons, hot springs and mud volcanoes have been known in Emilia-Romagna for a long time (Mosca, 1983). The comparison between the location of these surface manifestations and the active and potentially active recognized tectonic structures shows that most of the surface manifestations are located in areas where the subsoil is affected by important tectonic structures, many of which are considered active. This suggests that these structures could provide the pathway through which the fluid rise to the surface. Finally, we also attempted a comparison between the main active and potentially active structures and the ground movement. It is well known that the subsidence is due both to natural causes and anthropogenic factors. The natural subsidence is in turn the sum of several components: tectonics, consolidation and grain size of sediments, isostatic rebound following the deglaciation (Carminati et al. , 2003); anthropic subsidence is mainly due to the exploitation of fluids from subsoil (water and gas, Teatini et al. , 2005). It was observed that in areas affected by strong exploitation of fluids subsidence occurs with different rates. The comparison showed the minor rates or absence of subsidence are in correspondence of active structures while greater subsidence rates are in areas with high thickness of Quaternary sediments, corresponding to the main synclines. Concluding remarks. The main news from the previous issue are the following: • ���� ��������� ����� ����� ���� ������ ��� �������������� �������� ������� more extensive study area, well beyond the Emilia-Romagna regional limits; • ��� ����� ������� ���� ������� �� �� ������ ������ ��� ������ ��� ����������� ������ new field surveys have allowed us to better define the active and potentially active tectonic structures in the Apennine sector, as well as check and update the already known structures; • �������� ��� �������� �� ��� ������� ���� ���� ������� �� �� ������ ������������ ��� ������ analysis and revision of the subsoil data have allowed us to better characterize the buried tectonic structures, to realize and to represent a greater number of geological cross- sections, almost all of them deep more than 10 km; the mapping of the base unconformity of the Upper Emilia-Romagna Synthem (0.45 My, time reference for the evaluation of the activity degree of the tectonic structures) was also revised and expanded throughout the study area; • �������������� �� ���������� ���������� ��� ��������� �� ���� �������� �������� ������ representation of earthquake epicenters M≥4 available in INGV catalogs (CPTI15, ISIDe) and a considerable number of new focal mechanisms; • �������� �� ����� ���� �������� ��������� �� ���� ��� ��� ��� ����� ���� ��� ������� ������ revision of other data (natural emissions of oil, gas and hot water from the ground; ground movement monitoring, ...) useful to identify areas affected by current or recent tectonic activity; • ���������� ���� ��������� ��� ���������� ����������� ������� ���� ���� ���� comparison with Composite and Individual Seismogenic Sources from DISS 3.2. This allowed a more detailed representation of the active and potentially active tectonic structures recognized in Emilia-Romagna and surrounding areas. References Boccaletti M., Bonini M., Corti G., Gasperini P., Martelli L., Piccardi L., Severi P., Vannucci G. (2004): Carta sismotettonica della Regione Emilia-Romagna, scala 1:250.000. Con note illustrative . Regione Emilia-Romagna– SGSS, CNR-IGG. SELCA, Firenze. Caciagli M., Camassi R., Danesi S., Pondrelli S., Salimbeni S. (2015): Can We Consider the 1951 Caviaga (Northern Italy) Earthquakes as Noninduced Events? Seism. Res. Letters Vol. 86, N. 5 September/October 2015, 1335-1344 doi: 10.1785/0220150001. Carminati E., Doglioni C., Scrocca D. (2003): Apennines subduction-related subsidence of Venice (Italy) . Geophys. Res. Letters 30, doi:10.1029/2003GL017001. DISS Working Group (2015): Database of Individual Seismogenic Sources (DISS), Version 3.2.0: A compilation of potential sources for earthquakes larger than M 5.5 in Italy and surrounding areas . INGV DOI:10.6092/INGV. IT-DISS3.2.0. http://diss.rm.ingv.it/diss/ ISIDe Working Group INGV (2015): Italian Seismological Instrumental and parametric Database . http://iside. rm.ingv.it/iside/standard/index.jsp Martelli L. (coord.), Bonini M., Calabrese L., Corti G., Ercolessi G., Molinari F. C., Piccardi L., Pondrelli S., Sani F., Severi P. (2017): Carta sismotettonica della Regione Emilia-Romagna e aree limitrofe, scala 1:250.000, ed. 2016. Con note illustrative . Regione Emilia-Romagna, SGSS – CNR, IGG sez. FI – Università degli Studi di Firenze, DST – INGV sez. BO. D.R.E.AM . Italia