Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.3 on date 28-05-2021 and time 01:01:24 (Italy) in region 4 km N Sansepolcro (AR)

A magnitude ML 0.3 earthquake occured in region: 4 km N Sansepolcro (AR), on

  • 27-05-2021 23:01:24 (UTC)
  • 28-05-2021 01:01:24 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.6040, 12.1420 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
Sansepolcro AR 4 15884 15884
San Giustino PG 7 11297 27181
Anghiari AR 10 5638 32819
Pieve Santo Stefano AR 11 3183 36002
Citerna PG 12 3531 39533
Badia Tedalda AR 12 1087 40620
Monterchi AR 13 1757 42377
Caprese Michelangelo AR 13 1426 43803
Borgo Pace PU 14 606 44409
Mercatello sul Metauro PU 17 1378 45787
Sestino AR 17 1355 47142
Città di Castello PG 18 39913 87055
Monte Santa Maria Tiberina PG 19 1183 88238
Chiusi della Verna AR 20 2023 90261

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km NE of Arezzo (99543 inhabitants)
59 Km NW of Perugia (166134 inhabitants)
60 Km S of Cesena (96758 inhabitants)
61 Km SW of Rimini (147750 inhabitants)
69 Km S of Forlì (117913 inhabitants)
71 Km W of Pesaro (94582 inhabitants)
73 Km E of Siena (53903 inhabitants)
74 Km E of Firenze (382808 inhabitants)
76 Km W of Fano (60888 inhabitants)
79 Km S of Faenza (58541 inhabitants)
79 Km E of Scandicci (50609 inhabitants)
85 Km NW of Foligno (57155 inhabitants)
89 Km E of Prato (191150 inhabitants)
90 Km SE of Imola (69797 inhabitants)
91 Km S of Ravenna (159116 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 0.3 2021-05-27
23:01:24		 43.6045 12.142 10 2021-05-27
23:08:10		 Sala Sismica INGV-Roma 90548591
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-05-27 23:01:24 ± 0.12
Latitude 43.6045 ± 0.0099
Longitude 12.1420 ± 0.0087
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 90548591

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1129
Semi-minor axis of confidence ellipse (meter) 618
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 353
Circular confidence region, given by single value of horizontal uncertainty (meter) 1130.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 142
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 11
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.31746
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.3

Field Value
Value 0.3
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 90548591
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-05-27 23:08:10
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FIR.HHZ. 2021-05-27T23:01:39.20 3.0 undecidable manual P 0.15 0
IV.PIEI.HHZ. 2021-05-27T23:01:35.55 0.3 undecidable manual S 103 32.5452 50 -0.13 70
IV.APEC.HHZ. 2021-05-27T23:01:33.17 0.3 undecidable manual S 103 22.9548 112 0.38 67
IV.NARO.HHZ. 2021-05-27T23:01:31.05 0.1 undecidable manual P 89 35.2425 50 -0.19 92
IV.PIEI.HHZ. 2021-05-27T23:01:30.57 0.1 undecidable manual P 103 32.5452 50 -0.25 91
IV.PE3.EHZ. 2021-05-27T23:01:30.74 0.1 undecidable manual P 70 30.2475 50 0.28 91
IV.APEC.HHZ. 2021-05-27T23:01:29.33 0.1 undecidable manual P 103 22.9548 112 0.17 94
IV.BADI.EHZ. 2021-05-27T23:01:28.52 3.0 undecidable manual P 0
IV.PARC.HHZ. 2021-05-27T23:01:28.51 0.1 undecidable manual S 58 9.1797 136 -0.26 95
IV.CRE.HHZ. 2021-05-27T23:01:27.96 0.1 undecidable manual P 276 15.3735 122 0.16 96
IV.SSP9.EHZ. 2021-05-27T23:01:27.51 0.1 undecidable manual S 194 3.4965 160 -0.19 97
IV.SSP9.EHZ. 2021-05-27T23:01:26.24 0.1 undecidable manual P 194 3.4965 160 0.03 100
IV.PARC.HHZ. 2021-05-27T23:01:26.94 0.1 undecidable manual P 58 9.1797 136 0.11 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SSP9.EHE. ML:0.2 0.000028998675000000002 0.6016 AML other m 2021-05-27T23:01:27.78
IV.SSP9.EHN. ML:0.3 0.00003357516 0.1536 AML other m 2021-05-27T23:01:27.78
IV.PARC.HHE. ML:0.0 0.000016131852 0.4736 AML other m 2021-05-27T23:01:29.06
IV.PARC.HHN. ML:0.3 0.000026831479999999997 0.1024 AML other m 2021-05-27T23:01:28.54
IV.PIEI.HHE. ML:0.5 0.000012696699999999998 0.2176 AML other m 2021-05-27T23:01:35.97
IV.PIEI.HHN. ML:0.4 0.0000093674375 0.9216 AML other m 2021-05-27T23:01:35.76
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