Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 04-03-2021 and time 21:43:34 (Italy) in region 6 km SE Gualdo Tadino (PG)

A magnitude ML 1.1 earthquake occured in region: 6 km SE Gualdo Tadino (PG), on

  • 04-03-2021 20:43:34 (UTC)
  • 04-03-2021 21:43:34 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.2, 12.84 at 18 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
Gualdo Tadino PG 6 15208 15208
Fiuminata MC 8 1402 16610
Nocera Umbra PG 10 5839 22449
Sefro MC 11 422 22871
Esanatoglia MC 11 2034 24905
Pioraco MC 12 1134 26039
Fossato di Vico PG 13 2840 28879
Matelica MC 16 9981 38860
Valtopina PG 17 1398 40258
Serravalle di Chienti MC 17 1070 41328
Fabriano AN 17 31480 72808
Sigillo PG 17 2404 75212
Castelraimondo MC 18 4587 79799
Cerreto d'Esi AN 19 3817 83616
Valfabbrica PG 19 3389 87005
Gagliole MC 20 620 87625

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km NE of Foligno (57155 inhabitants)
38 Km E of Perugia (166134 inhabitants)
72 Km N of Terni (111501 inhabitants)
73 Km SW of Ancona (100861 inhabitants)
74 Km S of Fano (60888 inhabitants)
80 Km S of Pesaro (94582 inhabitants)
83 Km E of Arezzo (99543 inhabitants)
93 Km NW of Teramo (54892 inhabitants)
99 Km S of Rimini (147750 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 1.1 2021-03-04
20:43:34		 43.2 12.84 18 2021-03-04
20:50:39		 Sala Sismica INGV-Roma 87738071
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-04 20:43:34 ± 0.19
Latitude 43.20 ± 0.01
Longitude 12.84 ± 0.00
Depth (km) 18 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 87738071

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 642
Semi-minor axis of confidence ellipse (meter) 205
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 360
Circular confidence region, given by single value of horizontal uncertainty (meter) 640
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 155
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.09623
Epicentral distance of station farthest from the epicenter (degree) 0.33095
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 87738071
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-04 20:50:39
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ARVD.HHZ. 2021-03-04T20:43:46.45 0.6 undecidable manual S 14 0.3112 106 0.39 46
IV.FRON.EHZ. 2021-03-04T20:43:46.59 0.6 undecidable manual S 346 0.331 105 -0.03 49
IV.CSP1.EHZ. 2021-03-04T20:43:45.63 0.3 undecidable manual S 111 0.2887 108 0.2 71
IV.EL6.EHZ. 2021-03-04T20:43:44.03 0.3 undecidable manual S 55 0.2347 113 0.1 73
IV.SSFR.HHZ. 2021-03-04T20:43:44.47 0.3 undecidable manual S 351 0.2428 113 0.32 70
IV.ATCC.EHZ. 2021-03-04T20:43:41.68 0.3 undecidable manual S 266 0.143 130 0.09 75
IV.FRON.EHZ. 2021-03-04T20:43:41.29 1.0 negative manual P 346 0.331 105 -0.05 24
IV.CSP1.EHZ. 2021-03-04T20:43:40.70 0.6 negative manual P 111 0.2887 108 0.05 49
IV.SNTG.HHZ. 2021-03-04T20:43:40.32 0.3 undecidable manual S 52 0.0962 143 -0.33 73
IV.ARVD.HHZ. 2021-03-04T20:43:40.58 0.1 undecidable manual P 14 0.3112 106 -0.44 90
IV.FOSV.EHZ. 2021-03-04T20:43:40.80 0.6 undecidable manual S 331 0.1124 138 -0.15 50
IV.SSFR.HHZ. 2021-03-04T20:43:39.93 0.3 undecidable manual P 351 0.2428 113 0.02 75
IV.EL6.EHZ. 2021-03-04T20:43:39.82 0.3 positive manual P 55 0.2347 113 0.03 74
IV.FOSV.EHZ. 2021-03-04T20:43:38.05 0.6 positive manual P 331 0.1124 138 -0.02 51
IV.ATCC.EHZ. 2021-03-04T20:43:38.52 0.1 negative manual P 266 0.143 130 0.09 100
IV.SNTG.HHZ. 2021-03-04T20:43:37.80 0.3 undecidable manual P 52 0.0962 143 -0.1 76
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SNTG.HHE. ML:1.1 0.000107331 0.0768 AML other m 2021-03-04T20:43:40.77
IV.SNTG.HHN. ML:0.9 6.6218675E-5 0.0896 AML other m 2021-03-04T20:43:40.93
IV.SNTG.HNE. ML:1 8.9894805E-5 0.064 AML other m 2021-03-04T20:43:40.76
IV.SNTG.HNN. ML:1.4 0.0001943187 0.7296 AML other m 2021-03-04T20:43:46.54
IV.FOSV.EHE. ML:0.8 5.1487195E-5 0.1408 AML other m 2021-03-04T20:43:40.96
IV.FOSV.EHN. ML:1 8.0691665E-5 0.2688 AML other m 2021-03-04T20:43:41.30
IV.ATCC.EHE. ML:1 6.317504E-5 0.1664 AML other m 2021-03-04T20:43:42.17
IV.ATCC.EHN. ML:1.1 8.463055E-5 0.192 AML other m 2021-03-04T20:43:41.88
IV.EL6.EHE. ML:1.6 0.000186575635 0.1536 AML other m 2021-03-04T20:43:44.84
IV.EL6.EHN. ML:1.4 0.000110755775 0.1408 AML other m 2021-03-04T20:43:45.25
IV.SSFR.HHE. ML:1.2 7.564565E-5 0.128 AML other m 2021-03-04T20:43:45.02
IV.SSFR.HHN. ML:1.2 7.86456565E-5 0.2816 AML other m 2021-03-04T20:43:45.03
IV.SSFR.HNE. ML:1.4 0.000107817 0.1408 AML other m 2021-03-04T20:43:46.30
IV.SSFR.HNN. ML:1.3 9.34227E-5 0.2176 AML other m 2021-03-04T20:43:45.04
IV.CSP1.EHE. ML:1.2 6.889498E-5 0.7168 AML other m 2021-03-04T20:43:43.88
IV.CSP1.EHN. ML:1.3 7.4890775E-5 0.4736 AML other m 2021-03-04T20:43:44.06
IV.FRON.EHE. ML:0.8 2.008186E-5 0.0768 AML other m 2021-03-04T20:43:49.08
IV.FRON.EHN. ML:0.8 2.287628E-5 0.6144 AML other m 2021-03-04T20:43:59.55
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