INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of ML 1.4 on date 12-08-2018 and time 12:18:20 (Italy) in region 4 km W Sansepolcro (AR)

A magnitude ML 1.4 earthquake occured in region: 4 km W Sansepolcro (AR), on

  • 12-08-2018 10:18:20 (UTC)
  • 12-08-2018 12:18:20 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.56, 12.1 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.

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
Anghiari AR 4 5638 21522
San Giustino PG 7 11297 32819
Citerna PG 7 3531 36350
Monterchi AR 9 1757 38107
Pieve Santo Stefano AR 13 3183 41290
Caprese Michelangelo AR 13 1426 42716
Monte Santa Maria Tiberina PG 15 1183 43899
Città di Castello PG 17 39913 83812
Badia Tedalda AR 18 1087 84899
Subbiano AR 18 6331 91230
Capolona AR 19 5438 96668
Borgo Pace PU 19 606 97274
Chiusi della Verna AR 20 2023 99297

Municipalities with at least 50000 inhabitants

An earthquake occurred to
20 Km NE of Arezzo (99543 inhabitants)
56 Km NW of Perugia (166134 inhabitants)
65 Km S of Cesena (96758 inhabitants)
67 Km SW of Rimini (147750 inhabitants)
67 Km E of Siena (53903 inhabitants)
71 Km E of Firenze (382808 inhabitants)
74 Km S of Forlì (117913 inhabitants)
76 Km SW of Pesaro (94582 inhabitants)
77 Km E of Scandicci (50609 inhabitants)
81 Km W of Fano (60888 inhabitants)
82 Km S of Faenza (58541 inhabitants)
84 Km NW of Foligno (57155 inhabitants)
88 Km E of Prato (191150 inhabitants)
93 Km SE of Imola (69797 inhabitants)
95 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
Rev 100 ML 1.4 2018-08-12
10:18:20
43.56 12.1 10 2018-08-12
10:22:21
Sala Sismica INGV-Roma 59665941
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-08-12 10:18:20 ± 0.05
Latitude 43.56 ± 0.00
Longitude 12.10 ± 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 59665941

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 314
Semi-minor axis of confidence ellipse (meter) 256
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 30
Circular confidence region, given by single value of horizontal uncertainty (meter) 310
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 114
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.11
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.32106
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 22
Type of magnitude ML
Reference to an origin 59665941
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-08-12 10:22:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ATVO.HHZ. 2018-08-12T10:18:32.21 0.1 undecidable manual S 129 0.2896 50 0.06 96
IV.CAFI.HHZ. 2018-08-12T10:18:31.05 0.1 undecidable manual S 202 0.2527 50 -0.01 98
IV.ATMI.HHZ. 2018-08-12T10:18:31.24 0.1 undecidable manual S 151 0.2617 50 -0.08 96
IV.APEC.HHZ. 2018-08-12T10:18:30.68 0.1 undecidable manual S 91 0.2347 111 0.17 95
IV.ATPI.EHZ. 2018-08-12T10:18:30.96 0.1 undecidable manual S 117 0.2491 50 0.01 98
IV.MURB.HHZ. 2018-08-12T10:18:29.76 3.0 undecidable manual P -0.25 0
IV.PE3.EHZ. 2018-08-12T10:18:27.94 3.0 undecidable manual P 0.1 0
IV.PIEI.HHZ. 2018-08-12T10:18:27.77 0.1 negative manual P -0.09 1.58
IV.ATVO.HHZ. 2018-08-12T10:18:27.36 0.1 undecidable manual P 129 0.2896 50 -0.01 97
IV.ASQU.HHZ. 2018-08-12T10:18:27.99 0.1 undecidable manual P 316 0.3211 50 0.08 95
IV.CPGN.EHZ. 2018-08-12T10:18:27.65 1.0 undecidable manual P 0.35 0.39
IV.CAFI.HHZ. 2018-08-12T10:18:26.82 0.1 positive manual P 202 0.2527 50 0.08 97
IV.BADI.EHZ. 2018-08-12T10:18:26.64 0.1 undecidable manual S 117 0.1205 126 0.03 100
IV.ATMI.HHZ. 2018-08-12T10:18:26.88 0.1 undecidable manual P 151 0.2617 50 -0.01 98
IV.APEC.HHZ. 2018-08-12T10:18:26.23 0.1 undecidable manual P 91 0.2347 111 -0.19 95
IV.ATPI.EHZ. 2018-08-12T10:18:26.61 0.1 undecidable manual P 117 0.2491 50 -0.07 97
IV.BADI.EHZ. 2018-08-12T10:18:24.27 0.1 undecidable manual P 117 0.1205 126 0.1 99
IV.PARC.HHZ. 2018-08-12T10:18:24.32 0.1 positive manual P -0.06 1.58
IV.SSP9.EHZ. 2018-08-12T10:18:22.63 1.0 undecidable manual P -0.31 0.39
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SSP9.EHN. ML:2.4 0.004715 1.78 AML other m 2018-08-12T10:18:23.93
IV.SSP9.EHE. ML:2.1 0.002335 0.7 AML other m 2018-08-12T10:18:24.11
IV.PARC.HHE. ML:1.4 0.0002575 0.2 AML other m 2018-08-12T10:18:26.67
IV.PARC.HHN. ML:1.6 0.000341 0.5 AML other m 2018-08-12T10:18:26.75
IV.BADI.EHN. ML:1.3 0.0001965 0.72 AML other m 2018-08-12T10:18:28.61
IV.BADI.EHE. ML:1.4 0.0002465 0.8 AML other m 2018-08-12T10:18:29.52
IV.ATPI.EHE. ML:1 5.07E-5 0.7 AML other m 2018-08-12T10:18:31.10
IV.ATMI.HHE. ML:1.4 0.000137 0.18 AML other m 2018-08-12T10:18:31.45
IV.APEC.HHE. ML:1.5 0.0001765 0.32 AML other m 2018-08-12T10:18:31.64
IV.CAFI.HHE. ML:1.3 9.52E-5 0.22 AML other m 2018-08-12T10:18:31.57
IV.APEC.HHN. ML:1.5 0.0001785 0.14 AML other m 2018-08-12T10:18:31.63
IV.ATMI.HHN. ML:1.4 0.0001415 0.46 AML other m 2018-08-12T10:18:31.50
IV.CAFI.HHN. ML:1.3 0.0001031 0.32 AML other m 2018-08-12T10:18:31.61
IV.ATPI.EHN. ML:1.1 5.935E-5 0.72 AML other m 2018-08-12T10:18:32.82
IV.ASQU.HHN. ML:1 3.605E-5 0.48 AML other m 2018-08-12T10:18:33.03
IV.PIEI.HHE. ML:1.6 0.0001695 0.56 AML other m 2018-08-12T10:18:33.72
IV.PIEI.HHN. ML:1.3 7.53E-5 0.08 AML other m 2018-08-12T10:18:33.50
IV.PE3.EHE. ML:2.1 0.000482 1.68 AML other m 2018-08-12T10:18:34.15
IV.ATVO.HHN. ML:1.2 7.06E-5 1.52 AML other m 2018-08-12T10:18:34.94
IV.ASQU.HHE. ML:0.9 3.015E-5 0.48 AML other m 2018-08-12T10:18:34.66
IV.PE3.EHN. ML:1.9 0.000297 0.92 AML other m 2018-08-12T10:18:35.51
IV.ATVO.HHE. ML:1.1 6.07E-5 1.18 AML other m 2018-08-12T10:18:35.38
IV.MURB.HHE. ML:1.6 0.000122 0.2 AML other m 2018-08-12T10:18:40.33
IV.MURB.HHN. ML:1.5 9.645E-5 0.3 AML other m 2018-08-12T10:18:43.82
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