Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 16-05-2021 and time 16:06:42 (Italy) in region 6 km E Palazzuolo sul Senio (FI)

A magnitude ML 1.2 earthquake occured in region: 6 km E Palazzuolo sul Senio (FI), on

  • 16-05-2021 14:06:42 (UTC)
  • 16-05-2021 16:06:42 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.1400, 11.6180 at 10 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
Palazzuolo sul Senio FI 6 1154 1154
Marradi FI 7 3139 4293
Casola Valsenio RA 9 2617 6910
Tredozio FC 12 1212 8122
Castel del Rio BO 12 1246 9368
Fontanelice BO 14 1943 11311
Modigliana FC 14 4560 15871
Brisighella RA 15 7639 23510
Borgo Tossignano BO 16 3288 26798
Riolo Terme RA 18 5720 32518
Casalfiumanese BO 18 3438 35956
Portico e San Benedetto FC 18 756 36712
Firenzuola FI 19 4726 41438

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km SW of Imola (69797 inhabitants)
27 Km SW of Faenza (58541 inhabitants)
35 Km W of Forlì (117913 inhabitants)
45 Km SE of Bologna (386663 inhabitants)
50 Km W of Cesena (96758 inhabitants)
50 Km NE of Firenze (382808 inhabitants)
51 Km NE of Prato (191150 inhabitants)
55 Km NE of Scandicci (50609 inhabitants)
56 Km SW of Ravenna (159116 inhabitants)
60 Km E of Pistoia (90315 inhabitants)
76 Km W of Rimini (147750 inhabitants)
78 Km S of Ferrara (133155 inhabitants)
78 Km N of Arezzo (99543 inhabitants)
79 Km SE of Modena (184973 inhabitants)
92 Km SE of Carpi (70699 inhabitants)
94 Km N of Siena (53903 inhabitants)
95 Km E of Lucca (89046 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
Reviewed
Rev100 		ML 1.2 2021-05-16
14:06:42		 44.1402 11.6175 10 2021-05-16
14:15:51		 Sala Sismica INGV-Roma 90166561
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-05-16 14:06:42 ± 0.07
Latitude 44.1402 ± 0.0036
Longitude 11.6175 ± 0.0038
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 90166561

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 308
Semi-minor axis of confidence ellipse (meter) 250
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 133
Circular confidence region, given by single value of horizontal uncertainty (meter) 310.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 122
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.08993
Epicentral distance of station farthest from the epicenter (degree) 0.31206
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:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 9
Type of magnitude ML
Reference to an origin 90166561
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-05-16 14:15:51
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RUFI.EHZ. 2021-05-16T14:06:54.51 0.3 undecidable manual S 194 34.6431 50 0.03 72
IV.RINC.HHZ. 2021-05-16T14:06:52.99 0.3 undecidable manual S 182 28.1496 109 0.23 70
IV.SEI.HHZ. 2021-05-16T14:06:51.17 0.3 undecidable manual S 245 22.755 113 0.18 72
IV.RUFI.EHZ. 2021-05-16T14:06:49.39 0.3 undecidable manual P 194 34.6431 50 0 73
IV.RINC.HHZ. 2021-05-16T14:06:48.35 0.3 undecidable manual P 182 28.1496 109 -0.04 73
IV.VISG.HHZ. 2021-05-16T14:06:48.81 0.3 undecidable manual S 290 15.5733 121 0.04 75
IV.BRIS.HHZ. 2021-05-16T14:06:48.88 0.3 undecidable manual S 52 15.0738 122 0.24 72
IV.LMD.HHZ. 2021-05-16T14:06:47.07 0.3 undecidable manual S 134 9.9789 134 -0.15 74
IV.SEI.HHZ. 2021-05-16T14:06:47.25 0.1 undecidable manual P 245 22.755 113 -0.13 96
IV.BRIS.HHZ. 2021-05-16T14:06:46.03 0.1 undecidable manual P 52 15.0738 122 0.01 100
IV.LMD.HHZ. 2021-05-16T14:06:45.06 0.1 undecidable manual P 134 9.9789 134 -0.14 98
IV.VISG.HHZ. 2021-05-16T14:06:45.95 0.1 undecidable manual P 290 15.5733 121 -0.14 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHE. ML:1.2 0.00021353312000000003 0.0768 AML other m 2021-05-16T14:06:47.10
IV.LMD.HHN. ML:1.0 0.00013264645 0.0832 AML other m 2021-05-16T14:06:47.67
IV.BRIS.HHE. ML:1.4 0.0002629531 0.16 AML other m 2021-05-16T14:06:49.11
IV.VISG.HHE. ML:0.8 0.000059423085 0.1024 AML other m 2021-05-16T14:06:49.37
IV.BRIS.HHN. ML:1.4 0.0002297987 0.2816 AML other m 2021-05-16T14:06:49.74
IV.VISG.HHN. ML:1.0 0.000095257335 0.1408 AML other m 2021-05-16T14:06:49.88
IV.SEI.HHN. ML:1.6 0.000263 0.34 AML other m 2021-05-16T14:06:51.48
IV.SEI.HHE. ML:1.2 0.00010299515499999999 0.3392 AML other m 2021-05-16T14:06:51.81
IV.RINC.HHE. ML:1.1 0.000060674160000000007 0.2624 AML other m 2021-05-16T14:06:54.72
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