Earthquake with magnitude of ML 1.0 on date 09-09-2021 and time 16:55:59 (UTC) in region Premilcuore (FC)

A magnitude ML 1.0 earthquake occured in region: Premilcuore (FC), on

  • 09-09-2021 16:55:59 (UTC)
  • 09-09-2021 18:55:59 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.981, 11.774 at 9 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
Premilcuore FC 0 799 799
Portico e San Benedetto FC 5 756 1555
Rocca San Casciano FC 11 1910 3465
Galeata FC 11 2516 5981
Tredozio FC 11 1212 7193
Santa Sofia FC 11 4136 11329
Civitella di Romagna FC 14 3786 15115
San Godenzo FI 14 1167 16282
Marradi FI 17 3139 19421
Dovadola FC 18 1653 21074
Modigliana FC 20 4560 25634

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km SW of Forlì (117913 inhabitants)
35 Km S of Faenza (58541 inhabitants)
41 Km W of Cesena (96758 inhabitants)
42 Km S of Imola (69797 inhabitants)
48 Km E of Firenze (382808 inhabitants)
54 Km E of Scandicci (50609 inhabitants)
55 Km E of Prato (191150 inhabitants)
58 Km N of Arezzo (99543 inhabitants)
59 Km SW of Ravenna (159116 inhabitants)
64 Km W of Rimini (147750 inhabitants)
67 Km SE of Bologna (386663 inhabitants)
69 Km E of Pistoia (90315 inhabitants)
82 Km NE of Siena (53903 inhabitants)
92 Km W of Pesaro (94582 inhabitants)
96 Km S of Ferrara (133155 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
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 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 1.0 2021-09-09
16:55:59
43.9808 11.7743 9 2021-09-09
17:36:07
Sala Sismica INGV-Roma 95241971
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-09 16:55:59 ± 0.11
Latitude 43.9808 ± 0.0045
Longitude 11.7743 ± 0.0087
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95241971

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 675
Semi-minor axis of confidence ellipse (meter) 294
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 83
Circular confidence region, given by single value of horizontal uncertainty (meter) 680
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 161
Number of associated phases, regardless of their use for origin computation 36
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.38401
Number of stations at which the event was observed 28
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 95241971
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-09 17:36:07
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.RNCA.HHZ. 2021-09-09T16:57:30.38 3.0 undecidable manual Sg 11.63 0
IV.PLLN.EHZ. 2021-09-09T16:57:16.14 3.0 negative manual Pn 6.41 0
IV.ILOS.HHZ. 2021-09-09T16:57:13.43 3.0 undecidable manual Pg 9.67 0
IV.MRB1.HHZ. 2021-09-09T16:57:07.80 3.0 undecidable manual Sn -2.94 0
IV.EVRN.HHZ. 2021-09-09T16:57:05.81 3.0 positive manual Pn -8.45 0
IV.SACR.HHZ. 2021-09-09T16:57:03.38 3.0 undecidable manual Sg -0.17 0
IV.GIZZ.HHZ. 2021-09-09T16:57:02.43 3.0 negative manual Pn 3.81 0
IV.NDIM.HNZ. 2021-09-09T16:56:53.78 3.0 undecidable manual Sg 8.94 0
IX.PGN3.HHZ.02 2021-09-09T16:56:51.57 3.0 undecidable manual Pg 15.19 0
IV.GRIS.EHZ. 2021-09-09T16:56:51.74 3.0 undecidable manual Pn 4.14 0
GU.RNCA.HHZ. 2021-09-09T16:56:44.78 3.0 undecidable manual Pg 13.01 0
IV.SBPO.HNZ. 2021-09-09T16:56:43.52 3.0 undecidable manual Sn -1.48 0
GU.MGRO.HHZ. 2021-09-09T16:56:41.27 3.0 undecidable manual Pn -2.39 0
IV.POFI.HHZ. 2021-09-09T16:56:25.89 3.0 undecidable manual Pg 6.79 0
IV.SACR.HHZ. 2021-09-09T16:56:24.23 3.0 positive manual Pn 1 0
GU.GSCL.HHZ. 2021-09-09T16:56:22.05 3.0 undecidable manual Pg 6.2 0
IV.MELA.HHZ. 2021-09-09T16:56:21.63 3.0 undecidable manual Pn 1.97 0
IV.PII.HHZ. 2021-09-09T16:56:20.95 3.0 positive manual Pg 2.56 0
IV.CRE.HHZ. 2021-09-09T16:56:13.61 0.3 undecidable manual S 160 0.384 50 0.35 67
IV.TOLF.HHZ. 2021-09-09T16:56:13.38 3.0 positive manual Pn -7.5 0
IV.SEI.HHZ. 2021-09-09T16:56:11.00 0.3 undecidable manual S 284 0.3076 50 0 74
IV.BOSL.HHZ. 2021-09-09T16:56:10.95 0.3 undecidable manual S 260 0.2923 50 0.41 68
IV.TREG.EHZ. 2021-09-09T16:56:10.15 3.0 undecidable manual Pn -2.13 0
IV.VVLD.HHZ. 2021-09-09T16:56:09.48 3.0 positive manual Pn -7.71 0
IV.BRIS.HHZ. 2021-09-09T16:56:09.27 0.3 undecidable manual S 359 0.2437 109 0.37 69
IV.RUFI.EHZ. 2021-09-09T16:56:08.83 0.3 undecidable manual S 233 0.2383 109 0.12 73
IV.CAVE.HHZ. 2021-09-09T16:56:07.97 3.0 negative manual P -3.71 0
IV.VCEL.EHZ. 2021-09-09T16:56:07.93 3.0 undecidable manual Pn -1.79 0
IV.CRE.HHZ. 2021-09-09T16:56:06.89 0.3 undecidable manual P 160 0.384 50 -0.34 68
IV.ASQU.HHZ. 2021-09-09T16:56:06.88 0.3 undecidable manual S 177 0.1844 114 0.1 74
IV.BOSL.HHZ. 2021-09-09T16:56:05.54 0.1 undecidable manual P 260 0.2923 50 -0.12 96
IV.SEI.HHZ. 2021-09-09T16:56:05.59 0.1 undecidable manual P 284 0.3076 50 -0.34 92
IV.RUFI.EHZ. 2021-09-09T16:56:04.46 0.1 undecidable manual P 233 0.2383 109 -0.15 97
IV.BRIS.HHZ. 2021-09-09T16:56:04.62 0.1 undecidable manual P 359 0.2437 109 -0.1 98
IV.ASQU.HHZ. 2021-09-09T16:56:03.46 0.1 undecidable manual P 177 0.1844 114 -0.03 100
MN.TRI.HHZ. 2021-09-09T16:55:53.42 3.0 positive manual P -1.87 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BRIS.HHE. ML:1.3 0.000103346305 0.1408 AML other m 2021-09-09T16:56:09.47
IV.BRIS.HHN. ML:1.3 0.00010895 0.8 AML other m 2021-09-09T16:56:10.19
IV.BOSL.HHN. ML:0.6 1.934985E-5 0.2176 AML other m 2021-09-09T16:56:11.61
IV.BOSL.HHE. ML:0.5 1.464183E-5 0.2048 AML other m 2021-09-09T16:56:11.23
IV.ASQU.HHE. ML:1 7.3732055E-5 0.192 AML other m 2021-09-09T16:56:07.40
IV.ASQU.HHN. ML:0.6 2.892767E-5 0.2816 AML other m 2021-09-09T16:56:09.40
IV.SEI.HHE. ML:1.3 7.861126E-5 0.3584 AML other m 2021-09-09T16:56:12.93
IV.SEI.HHN. ML:1.4 0.00011441785 0.3456 AML other m 2021-09-09T16:56:11.50
IV.CRE.HHE. ML:0.5 9.679932E-6 0.2176 AML other m 2021-09-09T16:56:14.53
IV.CRE.HHN. ML:1.2 4.3416685E-5 0.3584 AML other m 2021-09-09T16:56:13.92
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download