Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 25-01-2021 and time 21:29:16 (Italy) in region 3 km W Citerna (PG)

A magnitude ML 0.8 earthquake occured in region: 3 km W Citerna (PG), on

  • 25-01-2021 20:29:16 (UTC)
  • 25-01-2021 21:29:16 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.5010, 12.0860 at 9 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
Citerna PG 3 3531 3531
Monterchi AR 3 1757 5288
Anghiari AR 5 5638 10926
Sansepolcro AR 9 15884 26810
San Giustino PG 9 11297 38107
Monte Santa Maria Tiberina PG 9 1183 39290
Città di Castello PG 13 39913 79203
Arezzo AR 17 99543 178746
Caprese Michelangelo AR 18 1426 180172
Pieve Santo Stefano AR 19 3183 183355
Subbiano AR 19 6331 189686
Capolona AR 20 5438 195124

Municipalities with at least 50000 inhabitants

An earthquake occurred to
17 Km E of Arezzo (99543 inhabitants)
50 Km NW of Perugia (166134 inhabitants)
64 Km E of Siena (53903 inhabitants)
72 Km S of Cesena (96758 inhabitants)
73 Km E of Firenze (382808 inhabitants)
73 Km SW of Rimini (147750 inhabitants)
78 Km E of Scandicci (50609 inhabitants)
79 Km NW of Foligno (57155 inhabitants)
80 Km S of Forlì (117913 inhabitants)
81 Km SW of Pesaro (94582 inhabitants)
84 Km W of Fano (60888 inhabitants)
89 Km S of Faenza (58541 inhabitants)
90 Km E of Prato (191150 inhabitants)
99 Km SE of Imola (69797 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 0.8 2021-01-25
20:29:16		 43.501 12.0863 9 2021-01-25
20:35:47		 Sala Sismica INGV-Roma 86574241
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-25 20:29:16 ± 0.09
Latitude 43.5010 ± 0.0018
Longitude 12.0863 ± 0.0037
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86574241

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 280
Semi-minor axis of confidence ellipse (meter) 86
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 291
Circular confidence region, given by single value of horizontal uncertainty (meter) 280.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 177
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.08
Epicentral distance of station closest to the epicenter (degree) 0.08004
Epicentral distance of station farthest from the epicenter (degree) 0.21224
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.1
Num. used stations 10
Type of magnitude ML
Reference to an origin 86574241
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-25 20:35:47
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ATMI.HHZ. 2021-01-25T20:29:25.67 0.3 undecidable manual S 142 23.5542 111 0.04 74
IV.PARC.HHZ. 2021-01-25T20:29:24.51 0.3 undecidable manual S 37 20.4684 114 -0.12 73
IV.CAFI.HHZ. 2021-01-25T20:29:24.87 0.3 undecidable manual S 207 21.3675 113 -0.05 74
IV.BADI.EHZ. 2021-01-25T20:29:22.24 0.3 undecidable manual S 86 12.7761 126 -0.06 75
IV.ATMI.HHZ. 2021-01-25T20:29:21.84 0.1 undecidable manual P 142 23.5542 111 -0.08 97
IV.PARC.HHZ. 2021-01-25T20:29:21.33 0.3 undecidable manual P 37 20.4684 114 -0.01 74
IV.SSP9.EHZ. 2021-01-25T20:29:21.26 0.3 undecidable manual S 24 8.88 136 -0.02 76
IV.CAFI.HHZ. 2021-01-25T20:29:21.49 0.3 undecidable manual P 207 21.3675 113 -0.02 74
IV.BADI.EHZ. 2021-01-25T20:29:20.10 0.3 undecidable manual P 86 12.7761 126 0.1 74
IV.SSP9.EHZ. 2021-01-25T20:29:19.54 0.3 undecidable manual P 24 8.88 136 0.13 74
IV.ATMC.EHZ. 2021-01-25T20:29:19.69 0.1 undecidable manual P 125 10.4784 131 0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SSP9.EHE. ML:1.0 0.00015696911500000002 3.136 AML other m 2021-01-25T20:29:22.58
IV.SSP9.EHN. ML:0.8 0.000090117646 1.5488 AML other m 2021-01-25T20:29:22.64
IV.BADI.EHE. ML:0.6 0.00004278386 0.1792 AML other m 2021-01-25T20:29:22.69
IV.BADI.EHN. ML:0.6 0.000044641288200000006 0.1024 AML other m 2021-01-25T20:29:22.51
IV.PARC.HHE. ML:0.7 0.000038425755 0.5376 AML other m 2021-01-25T20:29:24.79
IV.PARC.HHN. ML:0.8 0.000049301675 0.1408 AML other m 2021-01-25T20:29:25.22
IV.CAFI.HHE. ML:0.8 0.00004087813499999999 0.2048 AML other m 2021-01-25T20:29:25.34
IV.CAFI.HHN. ML:0.8 0.000040997304999999995 0.192 AML other m 2021-01-25T20:29:25.05
IV.ATMI.HHE. ML:0.8 0.000046819319999999995 0.4608 AML other m 2021-01-25T20:29:29.20
IV.ATMI.HHN. ML:1.0 0.000058833595000000005 0.3584 AML other m 2021-01-25T20:29:28.88
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