Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.3 on date 25-04-2021 and time 22:28:36 (UTC) in region 4 km SW Piobbico (PU)

A magnitude ML 0.3 earthquake occured in region: 4 km SW Piobbico (PU), on

  • 25-04-2021 22:28:36 (UTC)
  • 26-04-2021 00:28:36 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.5640, 12.4750 at 8 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
Piobbico PU 4 2029 2029
Apecchio PU 4 1882 3911
Sant'Angelo in Vado PU 12 4133 8044
Urbania PU 12 7099 15143
Pietralunga PG 14 2111 17254
Cagli PU 14 8731 25985
Mercatello sul Metauro PU 15 1378 27363
Peglio PU 15 696 28059
Cantiano PU 16 2245 30304
Acqualagna PU 17 4393 34697
Borgo Pace PU 18 606 35303
Piandimeleto PU 19 2167 37470
Fermignano PU 19 8596 46066
Lunano PU 19 1527 47593
Belforte all'Isauro PU 19 769 48362

Municipalities with at least 50000 inhabitants

An earthquake occurred to
49 Km E of Arezzo (99543 inhabitants)
51 Km N of Perugia (166134 inhabitants)
52 Km SW of Pesaro (94582 inhabitants)
54 Km SW of Fano (60888 inhabitants)
56 Km S of Rimini (147750 inhabitants)
66 Km S of Cesena (96758 inhabitants)
70 Km N of Foligno (57155 inhabitants)
81 Km SE of Forlì (117913 inhabitants)
84 Km W of Ancona (100861 inhabitants)
93 Km SE of Faenza (58541 inhabitants)
96 Km E of Siena (53903 inhabitants)
97 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
Reviewed
Rev100 		ML 0.3 2021-04-25
22:28:36		 43.5645 12.4748 8 2021-04-25
23:08:10		 Sala Sismica INGV-Roma 89477111
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-25 22:28:36 ± 0.11
Latitude 43.5645 ± 0.0036
Longitude 12.4748 ± 0.0025
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 89477111

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 388
Semi-minor axis of confidence ellipse (meter) 80
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 4
Circular confidence region, given by single value of horizontal uncertainty (meter) 390.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 129
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.04047
Epicentral distance of station farthest from the epicenter (degree) 0.19066
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.3

Field Value
Value 0.3
Uncertainty 0.4
Num. used stations 8
Type of magnitude ML
Reference to an origin 89477111
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-25 23:08:10
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PARC.HHZ. 2021-04-25T22:28:44.72 0.3 undecidable manual S 296 21.1677 112 -0.13 72
IV.FRON.EHZ. 2021-04-25T22:28:44.82 0.3 undecidable manual S 104 20.868 112 0.07 73
IV.BADI.EHZ. 2021-04-25T22:28:44.40 0.3 undecidable manual S 252 19.4694 113 0.08 73
IV.PE3.EHZ. 2021-04-25T22:28:43.07 0.3 undecidable manual S 7 14.6742 120 0.25 71
IV.BADI.EHZ. 2021-04-25T22:28:41.28 0.3 undecidable manual P 252 19.4694 113 0.07 73
IV.PARC.HHZ. 2021-04-25T22:28:41.25 0.1 undecidable manual P 296 21.1677 112 -0.26 94
IV.FRON.EHZ. 2021-04-25T22:28:41.40 0.1 undecidable manual P 104 20.868 112 -0.05 98
IV.NARO.HHZ. 2021-04-25T22:28:41.22 0.3 undecidable manual S 59 9.879 130 -0.25 72
IV.APEC.HHZ. 2021-04-25T22:28:40.26 0.3 undecidable manual S 261 4.4955 152 0 76
IV.PIEI.HHZ. 2021-04-25T22:28:40.40 0.3 undecidable manual S 123 5.7942 145 -0.1 75
IV.PE3.EHZ. 2021-04-25T22:28:40.49 0.3 undecidable manual P 7 14.6742 120 0.15 73
IV.NARO.HHZ. 2021-04-25T22:28:39.52 0.1 undecidable manual P 59 9.879 130 -0.04 100
IV.APEC.HHZ. 2021-04-25T22:28:39.00 0.3 undecidable manual P 261 4.4955 152 0.14 74
IV.PIEI.HHZ. 2021-04-25T22:28:39.11 0.1 undecidable manual P 123 5.7942 145 0.11 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.APEC.HHE. ML:0.0 0.000046899344999999996 0.1792 AML other m 2021-04-25T22:28:40.50
IV.PIEI.HHN. ML:0.6 0.0000771 0.06 AML other m 2021-04-25T22:28:40.45
IV.PIEI.HHE. ML:0.8 0.000130147925 0.0768 AML other m 2021-04-25T22:28:40.48
IV.NARO.HHN. ML:0.7 0.00007350000000000001 0.06 AML other m 2021-04-25T22:28:41.27
IV.NARO.HHE. ML:0.4 0.00003325 0.04 AML other m 2021-04-25T22:28:41.24
IV.PARC.HHE. ML:-0.2 0.0000033724973 0.1152 AML other m 2021-04-25T22:28:45.43
IV.PARC.HHN. ML:-0.2 0.000002846034 0.128 AML other m 2021-04-25T22:28:44.99
IV.FRON.EHE. ML:-0.2 0.0000035433645 0.1152 AML other m 2021-04-25T22:28:45.16
IV.FRON.EHN. ML:0.1 0.000009443125 0.0512 AML other m 2021-04-25T22:28:45.36
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