INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of ML 0.5 on date 26-12-2018 and time 01:22:48 (Italy) in region 3 km SW Portico e San Benedetto (FC)

A magnitude ML 0.5 earthquake occured in region: 3 km SW Portico e San Benedetto (FC), on

  • 26-12-2018 00:22:48 (UTC)
  • 26-12-2018 01:22:48 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.01, 11.76 at 7 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Portico e San Benedetto FC 3 756 756
Premilcuore FC 3 799 1555
Tredozio FC 8 1212 2767
Rocca San Casciano FC 9 1910 4677
Galeata FC 12 2516 7193
Santa Sofia FC 13 4136 11329
San Godenzo FI 14 1167 12496
Civitella di Romagna FC 14 3786 16282
Marradi FI 14 3139 19421
Dovadola FC 17 1653 21074
Modigliana FC 17 4560 25634

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km SW of Faenza (58541 inhabitants)
33 Km SW of Forlì (117913 inhabitants)
39 Km S of Imola (69797 inhabitants)
41 Km W of Cesena (96758 inhabitants)
48 Km NE of Firenze (382808 inhabitants)
54 Km NE of Scandicci (50609 inhabitants)
55 Km E of Prato (191150 inhabitants)
58 Km SW of Ravenna (159116 inhabitants)
61 Km N of Arezzo (99543 inhabitants)
64 Km SE of Bologna (386663 inhabitants)
65 Km W of Rimini (147750 inhabitants)
68 Km E of Pistoia (90315 inhabitants)
84 Km NE of Siena (53903 inhabitants)
93 Km W of Pesaro (94582 inhabitants)
93 Km S of Ferrara (133155 inhabitants)
97 Km SE of Modena (184973 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 100 ML 0.5 2018-12-26
00:22:48
44.01 11.76 7 2018-12-26
00:28:35
Sala Sismica INGV-Roma 64226931
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-12-26 00:22:48 ± 0.09
Latitude 44.01 ± 0.00
Longitude 11.76 ± 0.01
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 64226931

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 949
Semi-minor axis of confidence ellipse (meter) 201
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 251
Circular confidence region, given by single value of horizontal uncertainty (meter) 950
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 148
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.08184
Epicentral distance of station farthest from the epicenter (degree) 0.41009
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:0.5

Field Value
Value 0.5
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 64226931
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-12-26 00:28:35
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CRE.HHE. 2018-12-26T00:23:03.96 0.3 undecidable manual S 160 0.4101 50 -0.32 69
IV.CRE.HHE. 2018-12-26T00:22:58.11 0.3 undecidable manual P 160 0.4101 50 0.35 68
IV.ASQU.HHZ. 2018-12-26T00:22:57.41 0.3 undecidable manual S 175 0.2095 108 0.09 75
IV.RUFI.EHZ. 2018-12-26T00:22:54.62 0.1 undecidable manual P 227 0.2464 105 0.08 100
IV.SFI.EHZ. 2018-12-26T00:22:54.09 0.3 undecidable manual S 149 0.1178 119 0.02 77
IV.BRIS.HNZ. 2018-12-26T00:22:54.13 0.3 undecidable manual P 1 0.2185 107 0.19 73
IV.ASQU.HHZ. 2018-12-26T00:22:53.65 0.1 undecidable manual P 175 0.2095 108 -0.09 100
IV.LMD.HHZ. 2018-12-26T00:22:52.83 0.3 undecidable manual S 332 0.0818 129 -0.09 77
IV.LMD.HHZ. 2018-12-26T00:22:51.03 0.3 undecidable manual P 332 0.0818 129 -0.17 76
IV.SFI.EHZ. 2018-12-26T00:22:51.83 0.3 undecidable manual P 149 0.1178 119 -0.04 77
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHN. ML:0.3 3.48E-5 0.12 AML other m 2018-12-26T00:22:53.35
IV.LMD.HHE. ML:0.4 3.8E-5 0.92 AML other m 2018-12-26T00:22:53.02
IV.SFI.EHE. ML:0.6 4.63E-5 0.68 AML other m 2018-12-26T00:22:54.44
IV.SFI.EHN. ML:0.6 4.285E-5 0.54 AML other m 2018-12-26T00:22:54.44
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download