Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 23-01-2021 and time 11:27:06 (Italy) in region 2 km E Premilcuore (FC)

A magnitude ML 1.5 earthquake occured in region: 2 km E Premilcuore (FC), on

  • 23-01-2021 10:27:06 (UTC)
  • 23-01-2021 11:27:06 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.97, 11.8 at 8 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Premilcuore FC 2 799 799
Portico e San Benedetto FC 6 756 1555
Santa Sofia FC 9 4136 5691
Galeata FC 9 2516 8207
Rocca San Casciano FC 11 1910 10117
Civitella di Romagna FC 12 3786 13903
Tredozio FC 13 1212 15115
San Godenzo FI 15 1167 16282
Dovadola FC 18 1653 17935
Marradi FI 19 3139 21074
Bagno di Romagna FC 19 6026 27100

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km SW of Forlì (117913 inhabitants)
35 Km S of Faenza (58541 inhabitants)
40 Km W of Cesena (96758 inhabitants)
43 Km S of Imola (69797 inhabitants)
49 Km E of Firenze (382808 inhabitants)
55 Km E of Scandicci (50609 inhabitants)
57 Km N of Arezzo (99543 inhabitants)
57 Km E of Prato (191150 inhabitants)
59 Km SW of Ravenna (159116 inhabitants)
62 Km W of Rimini (147750 inhabitants)
69 Km SE of Bologna (386663 inhabitants)
71 Km E of Pistoia (90315 inhabitants)
82 Km NE of Siena (53903 inhabitants)
90 Km W of Pesaro (94582 inhabitants)
97 Km S of Ferrara (133155 inhabitants)
99 Km W of Fano (60888 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
Reviewed
Rev100 		ML 1.5 2021-01-23
10:27:06		 43.97 11.8 8 2021-01-23
10:35:51		 Sala Sismica INGV-Roma 86489401
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-23 10:27:06 ± 0.27
Latitude 43.97 ± 0.01
Longitude 11.80 ± 0.02
Depth (km) 8 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86489401

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1353
Semi-minor axis of confidence ellipse (meter) 798
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 72
Circular confidence region, given by single value of horizontal uncertainty (meter) 1350
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 159
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.6
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.37142
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 86489401
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-23 10:35:51
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.IOCA.HHZ. 2021-01-23T10:28:51.65 3.0 undecidable manual Sg 10.14 0
IV.GIZZ.HHZ. 2021-01-23T10:28:44.46 3.0 positive manual Pg 15.07 0
IV.MTGR.HHZ. 2021-01-23T10:28:32.37 3.0 undecidable manual Pn -0.81 0
IV.PTRJ.HNZ. 2021-01-23T10:28:31.08 3.0 undecidable manual Sn -1.78 0
IV.SELL.HHZ. 2021-01-23T10:28:27.23 3.0 positive manual Pn -4.39 0
IV.ZONE.HHZ. 2021-01-23T10:28:05.01 3.0 undecidable manual Sg 0.99 0
IV.IFOR.HHZ. 2021-01-23T10:27:52.22 3.0 undecidable manual Pn -5.14 0
MN.TRI.HHZ. 2021-01-23T10:27:29.24 3.0 undecidable manual Pg -3.57 0
GU.GRAM.HHZ. 2021-01-23T10:27:27.36 3.0 positive manual Pg -0.29 0
IV.CRE.HHN. 2021-01-23T10:27:20.12 0.3 undecidable manual S 163 0.3714 50 -0.14 70
IV.BRIS.HHN. 2021-01-23T10:27:17.57 0.3 undecidable manual S 355 0.2518 106 1.39 44
IV.RUFI.EHZ. 2021-01-23T10:27:16.23 0.3 undecidable manual S 237 0.2491 106 0.14 72
IV.RINC.HHE. 2021-01-23T10:27:13.19 0.1 undecidable manual S 238 0.1637 113 0.2 96
IV.CRE.HHN. 2021-01-23T10:27:13.90 0.3 undecidable manual P 163 0.3714 50 -0.38 67
IV.BRIS.HHN. 2021-01-23T10:27:12.57 0.1 undecidable manual P 355 0.2518 106 0.65 83
IV.RUFI.EHZ. 2021-01-23T10:27:11.99 0.1 undecidable manual P 237 0.2491 106 0.12 96
IV.LMD.HHZ. 2021-01-23T10:27:10.70 0.1 undecidable manual S 327 0.1232 120 -0.88 77
IV.SFI.EHZ. 2021-01-23T10:27:10.05 0.1 undecidable manual S 154 0.0764 133 -0.08 100
IV.RINC.HHE. 2021-01-23T10:27:10.38 0.3 undecidable manual P 238 0.1637 113 0.3 70
IV.LMD.HHZ. 2021-01-23T10:27:08.13 0.1 undecidable manual P 327 0.1232 120 -1.14 69
IV.SFI.EHZ. 2021-01-23T10:27:08.54 0.1 undecidable manual P 154 0.0764 133 0.11 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SFI.HNE. ML:1.7 0.000779 0.24 AML other m 2021-01-23T10:27:10.06
IV.SFI.EHE. ML:1.6 0.000734 0.26 AML other m 2021-01-23T10:27:10.06
IV.SFI.EHN. ML:1.5 0.0004625 0.08 AML other m 2021-01-23T10:27:10.09
IV.SFI.HNN. ML:1.5 0.0004715 0.08 AML other m 2021-01-23T10:27:10.09
IV.LMD.HHE. ML:1.4 0.0002735 1.46 AML other m 2021-01-23T10:27:10.83
IV.LMD.HHN. ML:1.4 0.0002475 0.78 AML other m 2021-01-23T10:27:10.52
IV.PTRJ.HHE. ML:3.8 0.000463 0.88 AML other m 2021-01-23T10:29:09.23
IV.PTRJ.HNE. ML:4.2 0.0010505 1.22 AML other m 2021-01-23T10:29:10.97
IV.PTRJ.HHN. ML:4.5 0.002235 0.68 AML other m 2021-01-23T10:29:10.58
IV.PTRJ.HNN. ML:4.5 0.002155 0.66 AML other m 2021-01-23T10:29:10.59
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