Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 20-01-2021 and time 19:19:20 (UTC) in region 5 km W Pietralunga (PG)

A magnitude ML 0.8 earthquake occured in region: 5 km W Pietralunga (PG), on

  • 20-01-2021 19:19:20 (UTC)
  • 20-01-2021 20:19:20 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.44, 12.37 at 7 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
Pietralunga PG 5 2111 2111
Montone PG 9 1680 3791
Città di Castello PG 11 39913 43704
Apecchio PU 14 1882 45586
Umbertide PG 15 16681 62267
Monte Santa Maria Tiberina PG 17 1183 63450
Gubbio PG 19 32216 95666
San Giustino PG 20 11297 106963

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km N of Perugia (166134 inhabitants)
40 Km E of Arezzo (99543 inhabitants)
60 Km NW of Foligno (57155 inhabitants)
68 Km SW of Pesaro (94582 inhabitants)
69 Km SW of Fano (60888 inhabitants)
71 Km S of Rimini (147750 inhabitants)
78 Km S of Cesena (96758 inhabitants)
85 Km E of Siena (53903 inhabitants)
91 Km SE of Forlì (117913 inhabitants)
95 Km W of Ancona (100861 inhabitants)
97 Km E of Firenze (382808 inhabitants)
100 Km N of Terni (111501 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 0.8 2021-01-20
19:19:20		 43.44 12.37 7 2021-01-20
19:44:44		 Sala Sismica INGV-Roma 86407011
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-20 19:19:20 ± 0.14
Latitude 43.44 ± 0.00
Longitude 12.37 ± 0.01
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86407011

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 460
Semi-minor axis of confidence ellipse (meter) 53
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 81
Circular confidence region, given by single value of horizontal uncertainty (meter) 460
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 106
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.268
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:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 86407011
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-20 19:44:44
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.SRES.HHZ. 2021-01-20T19:19:55.33 3.0 undecidable manual S -3.69 0
IV.GAVE.EHZ. 2021-01-20T19:19:35.50 3.0 undecidable manual P -0.18 0
IV.FRON.EHZ. 2021-01-20T19:19:30.74 0.3 undecidable manual S 73 0.268 103 0.05 96
IV.PARC.HHZ. 2021-01-20T19:19:29.41 0.6 undecidable manual S 335 0.2302 105 0.16 63
IV.NARO.HHZ. 2021-01-20T19:19:29.29 0.3 undecidable manual S 41 0.2284 105 0.09 96
IV.MURB.HHZ. 2021-01-20T19:19:28.94 0.3 undecidable manual S 148 0.2086 107 0.46 89
IV.ATVA.EHE. 2021-01-20T19:19:26.67 0.3 undecidable manual S 201 0.1727 110 -0.49 89
IV.BADI.EHZ. 2021-01-20T19:19:25.27 0.3 undecidable manual S 307 0.116 119 0.12 97
IV.PARC.HHZ. 2021-01-20T19:19:25.36 0.3 undecidable manual P 335 0.2302 105 -0.01 97
IV.FRON.EHZ. 2021-01-20T19:19:25.98 0.3 undecidable manual P 73 0.268 103 -0.22 92
IV.MURB.HHZ. 2021-01-20T19:19:24.93 0.3 undecidable manual P 148 0.2086 107 0.01 98
IV.NARO.HHZ. 2021-01-20T19:19:24.92 0.3 undecidable manual P 41 0.2284 105 -0.42 89
IV.ATVA.EHE. 2021-01-20T19:19:24.37 0.3 undecidable manual P 201 0.1727 110 0.2 95
IV.BADI.EHZ. 2021-01-20T19:19:23.10 0.3 undecidable manual P 307 0.116 119 0.1 98
IV.ATPI.EHZ. 2021-01-20T19:19:22.57 0.3 undecidable manual S 64 0.0243 159 -0.12 99
IV.ATPI.EHZ. 2021-01-20T19:19:21.65 0.3 undecidable manual P 64 0.0243 159 0.07 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ATPI.HNN. ML:0 0.000798 0.06 AML other m 2021-01-20T19:19:22.59
IV.ATPI.EHN. ML:0 0.0008125 0.06 AML other m 2021-01-20T19:19:22.59
IV.ATPI.EHE. ML:0 0.000818 0.08 AML other m 2021-01-20T19:19:22.63
IV.ATPI.HNE. ML:0 0.000819 0.08 AML other m 2021-01-20T19:19:22.63
IV.BADI.EHE. ML:1.4 0.0003055 0.16 AML other m 2021-01-20T19:19:25.65
IV.BADI.EHN. ML:1.2 0.000174 1 AML other m 2021-01-20T19:19:25.41
IV.MURB.HHN. ML:1 6.425E-5 1.12 AML other m 2021-01-20T19:19:29.15
IV.MURB.HHE. ML:1 7.35E-5 1.66 AML other m 2021-01-20T19:19:29.15
IV.FRON.EHN. ML:0.8 3.285E-5 0.08 AML other m 2021-01-20T19:19:31.42
IV.FRON.EHE. ML:0.6 2.2233275E-5 0.8576 AML other m 2021-01-20T19:19:31.10
IV.NARO.HHE. ML:0.4 1.334125E-5 0.064 AML other m 2021-01-20T19:19:29.84
IV.NARO.HHN. ML:0.5 1.82509855E-5 0.064 AML other m 2021-01-20T19:19:29.66
IV.PARC.HHE. ML:0.7 2.9228595E-5 0.1536 AML other m 2021-01-20T19:19:30.27
IV.PARC.HHN. ML:0.5 1.78924455E-5 0.1152 AML other m 2021-01-20T19:19:30.51
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