Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 27-01-2021 and time 15:39:29 (Italy) in region 5 km NW Sansepolcro (AR)

A magnitude ML 1.1 earthquake occured in region: 5 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) 43.6, 12.09 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 6 15884 15884
Anghiari AR 7 5638 21522
Pieve Santo Stefano AR 9 3183 24705
San Giustino PG 9 11297 36002
Caprese Michelangelo AR 10 1426 37428
Citerna PG 11 3531 40959
Monterchi AR 13 1757 42716
Badia Tedalda AR 15 1087 43803
Chiusi della Verna AR 17 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
Città di Castello PG 20 39913 100196

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 E of Firenze (382808 inhabitants)
70 Km S of Forlì (117913 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)
92 Km S of Ravenna (159116 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled 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 1.1 2021-01-27
14:39:29		 43.6 12.09 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 43.60 ± 0.00
Longitude 12.09 ± 0.00
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86632981

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 419
Semi-minor axis of confidence ellipse (meter) 272
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 204
Circular confidence region, given by single value of horizontal uncertainty (meter) 420
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 84
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 23
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.04137
Epicentral distance of station farthest from the epicenter (degree) 0.35793
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitude 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
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.NARO.HHZ. 2021-01-27T14:39:43.03 0.6 undecidable manual S 88 0.3579 50 0.22 45
IV.SFI.EHZ. 2021-01-27T14:39:42.66 0.6 undecidable manual S 331 0.3507 50 0.05 47
IV.PIEI.HHZ. 2021-01-27T14:39:42.07 0.6 undecidable manual S 101 0.331 50 0.05 47
IV.CAFI.HHZ. 2021-01-27T14:39:40.46 0.6 undecidable manual S 198 0.2833 50 -0.14 47
IV.ASQU.HHZ. 2021-01-27T14:39:40.51 0.6 undecidable manual S 313 0.2914 50 -0.34 45
IV.ATPI.EHZ. 2021-01-27T14:39:40.25 0.6 undecidable manual S 123 0.2725 50 -0.04 48
IV.SFI.EHZ. 2021-01-27T14:39:37.29 0.3 undecidable manual P 331 0.3507 50 0.23 68
IV.NARO.HHZ. 2021-01-27T14:39:36.99 0.1 undecidable manual P 88 0.3579 50 -0.19 91
IV.CAFI.HHZ. 2021-01-27T14:39:36.01 0.1 positive manual P 198 0.2833 50 0.11 94
IV.BADI.EHZ. 2021-01-27T14:39:36.07 0.6 undecidable manual S 128 0.1457 121 0.03 49
IV.PIEI.HHZ. 2021-01-27T14:39:36.48 0.1 undecidable manual P 101 0.331 50 -0.24 90
IV.CPGN.HNZ. 2021-01-27T14:39:36.06 0.3 undecidable manual P 40 0.2635 50 0.5 65
IV.ATPI.EHZ. 2021-01-27T14:39:35.65 0.1 undecidable manual P 123 0.2725 50 -0.07 95
IV.ASQU.HHZ. 2021-01-27T14:39:35.95 0.3 undecidable manual P 313 0.2914 50 -0.09 70
IV.CRE.HHZ. 2021-01-27T14:39:34.41 0.6 undecidable manual S 282 0.0989 132 -0.2 48
IV.PARC.HHZ. 2021-01-27T14:39:34.96 0.3 undecidable manual S 66 0.1205 126 -0.3 70
IT.SNS1.HNZ. 2021-01-27T14:39:33.40 0.3 undecidable manual S 128 0.0414 155 0.14 73
IV.SSP9.EHZ. 2021-01-27T14:39:33.08 0.6 undecidable manual S 128 0.0414 155 -0.18 48
IV.BADI.EHZ. 2021-01-27T14:39:33.33 0.1 undecidable manual P 128 0.1457 121 0.06 97
IV.CRE.HHZ. 2021-01-27T14:39:32.52 0.1 negative manual P 282 0.0989 132 0.08 98
IV.PARC.HHZ. 2021-01-27T14:39:32.82 0.1 undecidable manual P 66 0.1205 126 0 99
IV.SSP9.EHZ. 2021-01-27T14:39:31.68 0.1 undecidable manual P 128 0.0414 155 0.02 100
IT.SNS1.HNZ. 2021-01-27T14:39:31.80 0.1 undecidable manual P 128 0.0414 155 0.14 98
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 0.0001145 0.94 AML other m 2021-01-27T14:39:35.03
IV.PARC.HHN. ML:1.3 0.000232 0.12 AML other m 2021-01-27T14:39:35.09
IV.CRE.HHN. ML:1.1 0.0001665 0.56 AML other m 2021-01-27T14:39:35.79
IV.CAFI.HHN. ML:0.9 3.805E-5 0.18 AML other m 2021-01-27T14:39:41.18
IV.CAFI.HHE. ML:0.8 3.095E-5 0.62 AML other m 2021-01-27T14:39:41.38
IV.PIEI.HHE. ML:1.1 4.595E-5 1 AML other m 2021-01-27T14:39:42.46
IV.PIEI.HHN. ML:1 3.71E-5 0.78 AML other m 2021-01-27T14:39:43.11
TV.SF04.EHN. ML:1.8 7.3755E-5 0.12 AML other m 2021-01-27T14:40:06.85
TV.SF04.EHE. ML:2.2 0.0001785 0.16 AML other m 2021-01-27T14:40:18.39
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download