Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 27-01-2021 and time 14:39:29 (UTC) in region 6 km NW Sansepolcro (AR)

A magnitude ML 1.1 earthquake occured in region: 6 km NW Sansepolcro (AR), on

  • 27-01-2021 14:39:29 (UTC)
  • 27-01-2021 15:39:29 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.6010, 12.0860 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
Sansepolcro AR 6 15884 15884
Anghiari AR 7 5638 21522
Pieve Santo Stefano AR 8 3183 24705
San Giustino PG 9 11297 36002
Caprese Michelangelo AR 9 1426 37428
Citerna PG 12 3531 40959
Monterchi AR 13 1757 42716
Badia Tedalda AR 14 1087 43803
Chiusi della Verna AR 16 2023 45826
Subbiano AR 18 6331 52157
Chitignano AR 18 899 53056
Borgo Pace PU 18 606 53662
Capolona AR 19 5438 59100
Monte Santa Maria Tiberina PG 19 1183 60283

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km NE of Arezzo (99543 inhabitants)
60 Km NW of Perugia (166134 inhabitants)
61 Km S of Cesena (96758 inhabitants)
64 Km SW of Rimini (147750 inhabitants)
68 Km E of Siena (53903 inhabitants)
69 Km S of Forlì (117913 inhabitants)
69 Km E of Firenze (382808 inhabitants)
75 Km E of Scandicci (50609 inhabitants)
75 Km W of Pesaro (94582 inhabitants)
78 Km S of Faenza (58541 inhabitants)
80 Km W of Fano (60888 inhabitants)
85 Km E of Prato (191150 inhabitants)
87 Km NW of Foligno (57155 inhabitants)
89 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
Bulletin
Rev1000 		ML 1.1 2021-01-27
14:39:29		 43.6008 12.0857 10 2021-07-12
16:54:58		 Bollettino Sismico Italiano INGV 86969271
Reviewed
Rev100 		ML 1.1 2021-01-27
14:39:29		 43.599 12.0862 10 2021-01-27
14:45:43		 Sala Sismica INGV-Roma 86632981
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-27 14:39:29 ± 0.05
Latitude 43.6008 ± 0.0045
Longitude 12.0857 ± 0.0037
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 86969271

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 479
Semi-minor axis of confidence ellipse (meter) 284
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 206
Circular confidence region, given by single value of horizontal uncertainty (meter) 480.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 83
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.04317
Epicentral distance of station farthest from the epicenter (degree) 0.35793
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 86632981
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-27 14:45:43

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 86969271
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-02-09 12:38:38
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PIEI.HHZ. 2021-01-27T14:39:42.07 0.6 undecidable manual S 101 36.8298 50 0.09 47
IV.ASQU.HHZ. 2021-01-27T14:39:40.41 0.1 undecidable manual S 313 32.1456 50 -0.33 90
IV.CAFI.HHZ. 2021-01-27T14:39:40.46 0.6 undecidable manual S 198 31.6461 50 -0.13 47
IV.ATPI.EHZ. 2021-01-27T14:39:40.16 0.1 undecidable manual S 123 30.4473 50 -0.11 95
IV.SFI.EHZ. 2021-01-27T14:39:37.26 0.1 undecidable manual P 331 38.7279 50 0.3 90
IV.CPGN.HNZ. 2021-01-27T14:39:36.00 0.1 undecidable manual P 40 29.1486 50 0.52 87
IV.BADI.EHZ. 2021-01-27T14:39:36.00 0.1 undecidable manual S 128 16.2726 121 -0.02 99
IV.PIEI.HHZ. 2021-01-27T14:39:36.45 0.1 undecidable manual P 101 36.8298 50 -0.22 92
IV.NARO.HHZ. 2021-01-27T14:39:36.97 0.1 undecidable manual P 88 39.7269 50 -0.16 92
IV.ATPI.EHZ. 2021-01-27T14:39:35.65 0.1 undecidable manual P 123 30.4473 50 -0.04 96
IV.ASQU.HHZ. 2021-01-27T14:39:35.95 0.1 undecidable manual P 313 32.1456 50 -0.01 97
IV.CAFI.HHZ. 2021-01-27T14:39:35.97 0.1 positive manual P 198 31.6461 50 0.1 95
IV.CRE.HHZ. 2021-01-27T14:39:34.34 0.1 undecidable manual S 281 10.9779 132 -0.19 97
IV.PARC.HHZ. 2021-01-27T14:39:34.90 0.1 undecidable manual S 67 13.3755 126 -0.28 94
IV.BADI.EHZ. 2021-01-27T14:39:33.30 0.1 undecidable manual P 128 16.2726 121 0.07 98
IV.ATMC.EHE. 2021-01-27T14:39:33.87 0.6 undecidable manual P 153 19.1697 117 0.14 48
IV.SSP9.EHZ. 2021-01-27T14:39:33.04 0.1 undecidable manual S 129 4.7952 154 -0.17 98
IT.SNS1.HNZ. 2021-01-27T14:39:33.37 0.1 undecidable manual S 130 4.7952 154 0.16 98
IV.CRE.HHZ. 2021-01-27T14:39:32.48 0.1 undecidable manual P 281 10.9779 132 0.11 98
IV.PARC.HHZ. 2021-01-27T14:39:32.76 0.1 undecidable manual P 67 13.3755 126 0.01 100
IV.SSP9.EHZ. 2021-01-27T14:39:31.68 0.1 undecidable manual P 129 4.7952 154 0.07 100
IT.SNS1.HNZ. 2021-01-27T14:39:31.75 0.1 undecidable manual P 130 4.7952 154 0.14 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CRE.HHE. ML:1.1 0.0001525 0.38 AML other m 2021-01-27T14:39:34.81
IV.PARC.HHE. ML:1.0 0.00011449999999999999 0.94 AML other m 2021-01-27T14:39:35.03
IV.PARC.HHN. ML:1.3 0.00023199999999999997 0.12 AML other m 2021-01-27T14:39:35.09
IV.CRE.HHN. ML:1.1 0.00016649999999999998 0.56 AML other m 2021-01-27T14:39:35.79
IV.CAFI.HHN. ML:0.9 0.00003805 0.18 AML other m 2021-01-27T14:39:41.18
IV.CAFI.HHE. ML:0.8 0.00003095 0.62 AML other m 2021-01-27T14:39:41.38
IV.PIEI.HHE. ML:1.1 0.00004595 1 AML other m 2021-01-27T14:39:42.46
IV.PIEI.HHN. ML:1.0 0.0000371 0.78 AML other m 2021-01-27T14:39:43.11
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