Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 21-02-2021 and time 19:13:37 (Italy) in region 5 km E Castiglione dei Pepoli (BO)

A magnitude ML 1.4 earthquake occured in region: 5 km E Castiglione dei Pepoli (BO), on

  • 21-02-2021 18:13:37 (UTC)
  • 21-02-2021 19:13:37 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.1550, 11.2200 at 10 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Castiglione dei Pepoli BO 5 5648 5648
San Benedetto Val di Sambro BO 7 4315 9963
Monghidoro BO 11 3749 13712
Camugnano BO 11 1885 15597
Vernio PO 12 6060 21657
Grizzana Morandi BO 13 3916 25573
Firenzuola FI 13 4726 30299
Monzuno BO 14 6328 36627
Castel di Casio BO 15 3448 40075
Loiano BO 15 4294 44369
Cantagallo PO 17 3105 47474
Vergato BO 17 7639 55113
Barberino di Mugello FI 17 10836 65949
Sambuca Pistoiese PT 19 1626 67575
Alto Reno Terme BO 19 6960 74535

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km NE of Prato (191150 inhabitants)
34 Km NE of Pistoia (90315 inhabitants)
39 Km S of Bologna (386663 inhabitants)
43 Km N of Firenze (382808 inhabitants)
44 Km N of Scandicci (50609 inhabitants)
45 Km W of Imola (69797 inhabitants)
55 Km W of Faenza (58541 inhabitants)
59 Km SE of Modena (184973 inhabitants)
66 Km W of Forlì (117913 inhabitants)
67 Km NE of Lucca (89046 inhabitants)
75 Km SE of Carpi (70699 inhabitants)
76 Km SE of Reggio nell'Emilia (171345 inhabitants)
82 Km W of Cesena (96758 inhabitants)
82 Km NE of Pisa (89158 inhabitants)
82 Km SW of Ferrara (133155 inhabitants)
83 Km W of Ravenna (159116 inhabitants)
84 Km E of Viareggio (62467 inhabitants)
87 Km E of Massa (69479 inhabitants)
90 Km E of Carrara (63133 inhabitants)
93 Km NW of Arezzo (99543 inhabitants)
93 Km N of Siena (53903 inhabitants)
99 Km NE of Livorno (159219 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 1.4 2021-02-21
18:13:37		 44.1553 11.2205 10 2021-07-12
16:55:02		 Bollettino Sismico Italiano INGV 88250871
Reviewed
Rev100 		ML 1.6 2021-02-21
18:13:37		 44.1593 11.2123 10 2021-02-21
18:22:36		 Sala Sismica INGV-Roma 87360581
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-21 18:13:37 ± 0.09
Latitude 44.1553 ± 0.0045
Longitude 11.2205 ± 0.0075
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 88250871

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 467
Semi-minor axis of confidence ellipse (meter) 421
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 244
Circular confidence region, given by single value of horizontal uncertainty (meter) 470.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 93
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
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) 0.07105
Epicentral distance of station farthest from the epicenter (degree) 0.26170
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.4
Num. used stations 14
Type of magnitude ML
Reference to an origin 88250871
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-03-18 09:31:42

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 87360581
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-21 18:22:36
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ZCCA.HHZ. 2021-02-21T18:13:48.41 0.3 undecidable manual S 318 29.0487 50 0.62 58
IV.MTRZ.HHZ. 2021-02-21T18:13:46.44 0.3 undecidable manual S 43 23.8539 112 0.32 72
IV.RONT.HHZ. 2021-02-21T18:13:46.54 0.3 undecidable manual S 137 24.6531 111 0.16 74
IV.MPPT.EHZ. 2021-02-21T18:13:46.52 0.3 undecidable manual S 205 24.2535 111 0.27 72
IV.MOCL.EHZ. 2021-02-21T18:13:44.30 0.3 undecidable manual S 191 16.9719 119 0.34 72
IV.ZCCA.HHZ. 2021-02-21T18:13:43.05 0.3 undecidable manual P 318 29.0487 50 -0.27 74
IV.SEI.HHZ. 2021-02-21T18:13:43.67 0.3 undecidable manual S 136 15.6732 121 0.1 76
IV.MPPT.EHZ. 2021-02-21T18:13:42.15 0.3 undecidable manual P 205 24.2535 111 -0.28 72
IV.MTRZ.HHZ. 2021-02-21T18:13:42.20 0.3 undecidable manual P 43 23.8539 112 -0.15 73
IV.RONT.HHZ. 2021-02-21T18:13:42.43 0.3 undecidable manual P 137 24.6531 111 -0.08 74
IV.MOCL.EHZ. 2021-02-21T18:13:41.15 0.3 undecidable manual P 191 16.9719 119 0.04 76
IV.FNVD.HHZ. 2021-02-21T18:13:41.35 0.3 undecidable manual S 280 7.881 140 -0.14 74
IV.SEI.HHZ. 2021-02-21T18:13:40.81 0.1 positive manual P 136 15.6732 121 -0.07 100
IV.FNVD.HHZ. 2021-02-21T18:13:39.43 0.1 positive manual P 280 7.881 140 -0.25 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SEI.HHE. ML:1.7 0.000523 0.44 AML other m 2021-02-21T18:13:44.26
IV.SEI.HHN. ML:1.7 0.0005043256 0.2048 AML other m 2021-02-21T18:13:44.06
IV.MTRZ.HHN. ML:1.2 0.000096439885 0.256 AML other m 2021-02-21T18:13:48.22
IV.RONT.HHN. ML:1.4 0.00015756765 0.1408 AML other m 2021-02-21T18:13:47.55
IV.MTRZ.HHE. ML:1.4 0.00016949999999999997 0.56 AML other m 2021-02-21T18:13:48.16
IV.RONT.HHE. ML:1.6 0.0002715 0.2 AML other m 2021-02-21T18:13:48.36
IV.MPPT.EHE. ML:0.6 0.00002508535 0.3968 AML other m 2021-02-21T18:13:49.09
IV.MPPT.EHN. ML:0.5 0.00001766626 0.384 AML other m 2021-02-21T18:13:47.77
IV.MTRZ.HNE. ML:1.4 0.000167757305 0.448 AML other m 2021-02-21T18:13:50.32
IV.MTRZ.HNN. ML:1.6 0.000217594755 0.4352 AML other m 2021-02-21T18:13:51.21
IV.ZCCA.HNN. ML:2.4 0.0012442765 0.7424 AML other m 2021-02-21T18:13:42.28
IV.ZCCA.HHE. ML:1.0 0.00004604082 0.6016 AML other m 2021-02-21T18:13:51.80
IV.ZCCA.HHN. ML:0.8 0.000035837855 0.7424 AML other m 2021-02-21T18:13:50.94
IV.ZCCA.HNE. ML:1.3 0.000103549165 0.9472 AML other m 2021-02-21T18:13:51.59
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