Earthquake with magnitude of ML 0.1 on date 03-08-2021 and time 21:39:57 (Italy) in region 4 km W Nocera Umbra (PG)

A magnitude ML 0.1 earthquake occured in region: 4 km W Nocera Umbra (PG), on

  • 03-08-2021 19:39:57 (UTC)
  • 03-08-2021 21:39:57 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.104, 12.749 at 11 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
Nocera Umbra PG 4 5839 5839
Valtopina PG 5 1398 7237
Assisi PG 11 28299 35536
Valfabbrica PG 13 3389 38925
Spello PG 14 8645 47570
Gualdo Tadino PG 15 15208 62778
Bastia Umbra PG 17 21874 84652
Foligno PG 17 57155 141807
Serravalle di Chienti MC 17 1070 142877
Sefro MC 17 422 143299
Fiuminata MC 18 1402 144701
Cannara PG 18 4305 149006

Municipalities with at least 50000 inhabitants

An earthquake occurred to
17 Km N of Foligno (57155 inhabitants)
29 Km E of Perugia (166134 inhabitants)
61 Km N of Terni (111501 inhabitants)
81 Km SE of Arezzo (99543 inhabitants)
85 Km SW of Ancona (100861 inhabitants)
85 Km S of Fano (60888 inhabitants)
91 Km S of Pesaro (94582 inhabitants)
92 Km NW of Teramo (54892 inhabitants)
93 Km NE of Viterbo (67173 inhabitants)
99 Km NW of L'Aquila (69753 inhabitants)
Recent and historical seismicity
Seismic hazard
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
ML 0.1 2021-08-03
43.104 12.7487 11 2021-08-03
Sala Sismica INGV-Roma 93633791
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2021-08-03 19:39:57 ± 0.03
Latitude 43.1040 ± 0.0027
Longitude 12.7487 ± 0.0025
Depth (km) 11 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 93633791


Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 320
Semi-minor axis of confidence ellipse (meter) 190
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 18
Circular confidence region, given by single value of horizontal uncertainty (meter) 320
Confidence level of the uncertainty (%) 68


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 131
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.05
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.25631
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 4
Magnitude information


Field Value
Value 0.1
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 93633791
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-03 20:26:39
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CSNT.HHZ. 2021-08-03T19:40:20.62 3.0 undecidable manual P -0.07 0
TV.SF04.EHZ. 2021-08-03T19:40:16.18 3.0 undecidable manual P 0.41 0
IV.FDMO.HHZ. 2021-08-03T19:40:07.71 0.6 undecidable manual S 105 0.2563 90 0.01 66
IV.MML1.EHZ. 2021-08-03T19:40:04.94 0.6 undecidable manual S 87 0.1628 90 0 67
IV.ATCC.EHZ. 2021-08-03T19:40:03.41 0.6 undecidable manual S 316 0.1133 103 -0.06 68
IV.FDMO.HHZ. 2021-08-03T19:40:03.34 1.0 undecidable manual P 105 0.2563 90 -0.11 32
IV.ASSB.HHZ. 2021-08-03T19:40:02.80 0.6 undecidable manual S 227 0.0899 120 -0.03 67
IV.ATCC.EHZ. 2021-08-03T19:40:01.08 0.3 undecidable manual P 316 0.1133 103 0.07 100
IV.MML1.EHZ. 2021-08-03T19:40:01.84 0.6 undecidable manual P 87 0.1628 90 -0.01 67
IV.ASSB.HHZ. 2021-08-03T19:40:00.71 0.6 undecidable manual P 227 0.0899 120 0.08 68
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ATCC.EHE. ML:0.7 5.26E-5 0.22 AML other m 2021-08-03T19:40:03.76
IV.ATCC.EHN. ML:0.6 3.785E-5 0.5 AML other m 2021-08-03T19:40:03.85
IV.MML1.EHE. ML:-0.2 7.109653E-6 0.256 AML other m 2021-08-03T19:40:04.83
IV.MML1.EHN. ML:-0.2 7.3492895E-6 0.1152 AML other m 2021-08-03T19:40:05.36
IV.FDMO.HHE. ML:0 4.656202E-6 0.6144 AML other m 2021-08-03T19:40:07.79
IV.FDMO.HHN. ML:0 3.744541E-6 1.0112 AML other m 2021-08-03T19:40:07.75
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download