Earthquake with magnitude of ML 0.9 on date 26-10-2021 and time 23:37:29 (UTC) in region 3 km SE Portico e San Benedetto (FC)

A magnitude ML 0.9 earthquake occured in region: 3 km SE Portico e San Benedetto (FC), on

  • 26-10-2021 23:37:29 (UTC)
  • 27-10-2021 01:37:29 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.01, 11.81 at 16 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 5 799 1555
Rocca San Casciano FC 6 1910 3465
Galeata FC 8 2516 5981
Tredozio FC 9 1212 7193
Civitella di Romagna FC 10 3786 10979
Santa Sofia FC 11 4136 15115
Dovadola FC 14 1653 16768
Modigliana FC 16 4560 21328
Predappio FC 17 6346 27674
Marradi FI 17 3139 30813
San Godenzo FI 18 1167 31980

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km SW of Forlì (117913 inhabitants)
31 Km S of Faenza (58541 inhabitants)
37 Km W of Cesena (96758 inhabitants)
39 Km S of Imola (69797 inhabitants)
52 Km NE of Firenze (382808 inhabitants)
55 Km SW of Ravenna (159116 inhabitants)
58 Km E of Scandicci (50609 inhabitants)
59 Km E of Prato (191150 inhabitants)
61 Km N of Arezzo (99543 inhabitants)
61 Km W of Rimini (147750 inhabitants)
66 Km SE of Bologna (386663 inhabitants)
72 Km E of Pistoia (90315 inhabitants)
86 Km NE of Siena (53903 inhabitants)
89 Km W of Pesaro (94582 inhabitants)
93 Km S of Ferrara (133155 inhabitants)
99 Km W of Fano (60888 inhabitants)
100 Km SE of Modena (184973 inhabitants)
Recent and historical seismicity
Seismic hazard
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
ML 0.9 2021-10-26
44.0103 11.8097 16 2021-10-26
Sala Sismica INGV-Roma 97010881
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2021-10-26 23:37:29 ± 0.12
Latitude 44.0103 ± 0.0018
Longitude 11.8097 ± 0.0038
Depth (km) 16 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97010881


Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 298
Semi-minor axis of confidence ellipse (meter) 152
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 275
Circular confidence region, given by single value of horizontal uncertainty (meter) 300
Confidence level of the uncertainty (%) 68


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 174
Number of associated phases, regardless of their use for origin computation 7
Number of defining phases 6
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.07
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.27609
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 3
Magnitude information


Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 97010881
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-26 23:48:25
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MURB.HNZ. 2021-10-26T23:37:45.92 3.0 undecidable manual P 0.01 0
IV.RUFI.EHZ. 2021-10-26T23:37:40.16 0.1 undecidable manual S 232 0.2761 104 0.01 97
IV.BRIS.HHZ. 2021-10-26T23:37:38.47 0.1 undecidable manual S 352 0.2167 110 0.02 98
IV.RUFI.EHZ. 2021-10-26T23:37:35.55 0.6 undecidable manual P 232 0.2761 104 -0.04 48
IV.SFI.EHZ. 2021-10-26T23:37:35.67 0.1 undecidable manual S 166 0.1088 134 -0.04 100
IV.BRIS.HHZ. 2021-10-26T23:37:34.56 0.1 undecidable manual P 352 0.2167 110 -0.05 98
IV.SFI.EHZ. 2021-10-26T23:37:33.10 0.3 positive manual P 166 0.1088 134 0.08 74
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SFI.EHE. ML:0.8 5.105E-5 0.3 AML other m 2021-10-26T23:37:35.73
IV.SFI.EHN. ML:0.7 4.035E-5 1.12 AML other m 2021-10-26T23:37:35.22
IV.BRIS.HHE. ML:1 5.755E-5 0.3 AML other m 2021-10-26T23:37:38.54
IV.BRIS.HHN. ML:1 4.865E-5 0.22 AML other m 2021-10-26T23:37:38.70
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download