Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 29-07-2021 and time 03:01:46 (Italy) in region 3 km E Massa Martana (PG)

A magnitude ML 1.0 earthquake occured in region: 3 km E Massa Martana (PG), on

  • 29-07-2021 01:01:46 (UTC)
  • 29-07-2021 03:01:46 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7840, 12.5610 at 6 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
Massa Martana PG 3 3770 3770
Giano dell'Umbria PG 6 3846 7616
Castel Ritaldi PG 10 3278 10894
Acquasparta TR 10 4778 15672
Todi PG 13 16851 32523
Gualdo Cattaneo PG 14 6155 38678
Montefalco PG 15 5679 44357
Spoleto PG 16 38218 82575
Montecastrilli TR 16 5022 87597
Collazzone PG 16 3473 91070
Bevagna PG 17 5081 96151
Fratta Todina PG 18 1839 97990
Avigliano Umbro TR 18 2558 100548
Monte Castello di Vibio PG 18 1567 102115
Campello sul Clitunno PG 18 2442 104557
Trevi PG 19 8469 113026
San Gemini TR 19 5018 118044

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km SW of Foligno (57155 inhabitants)
26 Km N of Terni (111501 inhabitants)
39 Km SE of Perugia (166134 inhabitants)
55 Km NE of Viterbo (67173 inhabitants)
84 Km NW of L'Aquila (69753 inhabitants)
88 Km N of Guidonia Montecelio (88673 inhabitants)
93 Km N of Tivoli (56533 inhabitants)
94 Km SE of Arezzo (99543 inhabitants)
95 Km W of Teramo (54892 inhabitants)
99 Km N of Roma (2864731 inhabitants)
99 Km NE of Civitavecchia (52991 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 1.0 2021-07-29
01:01:46		 42.7838 12.561 6 2021-07-29
01:22:55		 Sala Sismica INGV-Roma 93324861
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-29 01:01:46 ± 0.12
Latitude 42.7838 ± 0.0036
Longitude 12.5610 ± 0.0110
Depth (km) 6 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 93324861

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 865
Semi-minor axis of confidence ellipse (meter) 297
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 266
Circular confidence region, given by single value of horizontal uncertainty (meter) 870.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 194
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.56298
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 10
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.1
Num. used stations 12
Type of magnitude ML
Reference to an origin 93324861
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-29 01:22:55
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-07-29T01:02:07.21 0.6 undecidable manual S 57 62.493 50 0.6 41
IV.MC2.EHZ. 2021-07-29T01:02:04.53 0.6 undecidable manual S 74 53.0025 50 0.45 44
IV.MPAG.EHZ. 2021-07-29T01:02:04.04 3.0 undecidable manual P 0.34 0
IV.MML1.EHZ. 2021-07-29T01:02:03.02 0.6 undecidable manual S 42 49.5171 50 -0.13 47
IV.NRCA.HHZ. 2021-07-29T01:02:02.09 0.6 undecidable manual S 83 45.3213 50 0.05 49
IV.ATCC.EHZ. 2021-07-29T01:02:01.93 0.6 undecidable manual S 8 45.0216 50 -0.01 49
IV.MMUR.HNZ. 2021-07-29T01:01:59.45 3.0 positive manual P -1.86 0
IV.CESI.HHZ. 2021-07-29T01:01:59.47 0.6 undecidable manual S 49 37.1295 100 -0.06 49
IV.CSP1.EHZ. 2021-07-29T01:01:57.93 0.6 undecidable manual P 57 62.493 50 -0.16 46
IV.MC2.EHZ. 2021-07-29T01:01:56.38 1.0 undecidable manual P 74 53.0025 50 -0.25 23
IV.ASSB.HHZ. 2021-07-29T01:01:56.89 0.6 undecidable manual S 15 29.748 102 -0.12 49
IV.ATCC.EHZ. 2021-07-29T01:01:55.22 1.0 negative manual P 8 45.0216 50 -0.17 24
IV.MML1.EHZ. 2021-07-29T01:01:55.92 0.1 undecidable manual P 42 49.5171 50 -0.17 94
IV.ARRO.EHZ. 2021-07-29T01:01:55.92 0.6 undecidable manual S 144 28.1496 103 -0.55 45
IV.NRCA.HHZ. 2021-07-29T01:01:55.20 0.3 positive manual P 83 45.3213 50 -0.25 70
IV.CESX.HHZ. 2021-07-29T01:01:53.79 0.6 undecidable manual S 174 19.5693 108 0.2 49
IV.CESI.HHZ. 2021-07-29T01:01:53.97 0.3 positive manual P 49 37.1295 100 -0.03 74
IV.ARRO.EHZ. 2021-07-29T01:01:52.50 0.6 positive manual P 144 28.1496 103 0.27 48
IV.ASSB.HHZ. 2021-07-29T01:01:52.59 0.1 positive manual P 15 29.748 102 0.05 100
IV.CESX.HHZ. 2021-07-29T01:01:50.71 1.0 negative manual P 174 19.5693 108 0.14 25
IV.MOMA.HHZ. 2021-07-29T01:01:48.86 0.6 undecidable manual S 18 2.2977 160 0.05 52
IV.MOMA.HHZ. 2021-07-29T01:01:48.02 0.6 undecidable manual P 18 2.2977 160 0.21 51
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESX.HHN. ML:1.2 0.000121 0.18 AML other m 2021-07-29T01:01:54.06
IV.CESX.HHE. ML:1.1 0.00010499999999999999 0.26 AML other m 2021-07-29T01:01:55.66
IV.ASSB.HHN. ML:1.0 0.0000492 1.6 AML other m 2021-07-29T01:01:58.84
IV.ARRO.EHN. ML:0.8 0.000036849999999999994 0.92 AML other m 2021-07-29T01:01:59.53
IV.ASSB.HHE. ML:1.0 0.00004895 1.26 AML other m 2021-07-29T01:01:59.81
IV.CESI.HHE. ML:0.9 0.00002875 1.06 AML other m 2021-07-29T01:01:59.41
IV.CESI.HHN. ML:1.0 0.000038 1.04 AML other m 2021-07-29T01:02:00.17
IV.ARRO.EHE. ML:0.8 0.00003235000000000001 0.56 AML other m 2021-07-29T01:02:02.18
IV.NRCA.HHN. ML:1.1 0.0000387 0.14 AML other m 2021-07-29T01:02:03.19
IV.ATCC.EHE. ML:1.1 0.000040300000000000004 1.36 AML other m 2021-07-29T01:02:03.28
IV.NRCA.HHE. ML:1.0 0.00003065 1.54 AML other m 2021-07-29T01:02:04.21
IV.ATCC.EHN. ML:1.0 0.00003135 0.48 AML other m 2021-07-29T01:02:06.24
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