Earthquake with magnitude of ML 1.2 on date 28-07-2021 and time 17:34:42 (UTC) in region 6 km NW Massa Martana (PG)

A magnitude ML 1.2 earthquake occured in region: 6 km NW Massa Martana (PG), on

  • 28-07-2021 17:34:42 (UTC)
  • 28-07-2021 19:34:42 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8280, 12.4960 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.

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 6 3770 3770
Giano dell'Umbria PG 7 3846 7616
Todi PG 9 16851 24467
Collazzone PG 9 3473 27940
Gualdo Cattaneo PG 10 6155 34095
Fratta Todina PG 11 1839 35934
Monte Castello di Vibio PG 12 1567 37501
Castel Ritaldi PG 14 3278 40779
Montefalco PG 15 5679 46458
Bevagna PG 15 5081 51539
Acquasparta TR 16 4778 56317
Marsciano PG 16 18902 75219
Deruta PG 18 9669 84888
San Venanzo TR 19 2218 87106
Montecastrilli TR 20 5022 92128
Avigliano Umbro TR 20 2558 94686

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km SW of Foligno (57155 inhabitants)
32 Km NW of Terni (111501 inhabitants)
32 Km S of Perugia (166134 inhabitants)
56 Km NE of Viterbo (67173 inhabitants)
87 Km SE of Arezzo (99543 inhabitants)
91 Km NW of L'Aquila (69753 inhabitants)
94 Km N of Guidonia Montecelio (88673 inhabitants)
99 Km N of Tivoli (56533 inhabitants)
100 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 1.2 2021-07-28
17:34:42
42.8278 12.4962 8 2021-07-28
17:45:56
Sala Sismica INGV-Roma 93314161
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-28 17:34:42 ± 0.07
Latitude 42.8278 ± 0.0036
Longitude 12.4962 ± 0.0049
Depth (km) 8 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 93314161

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 439
Semi-minor axis of confidence ellipse (meter) 423
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 72
Circular confidence region, given by single value of horizontal uncertainty (meter) 440.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 173
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.11
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.58186
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 93314161
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-28 17:45:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ESML.HHZ. 2021-07-28T17:36:18.20 3.0 positive manual Pg 13.52 0
IV.VOBA.EHZ. 2021-07-28T17:36:17.44 3.0 undecidable manual Sg 7.07 0
RF.GEPF.HHZ. 2021-07-28T17:36:17.20 3.0 undecidable manual Sn -0.77 0
IV.EUCT.HNZ. 2021-07-28T17:36:16.43 3.0 undecidable manual Sn 0.13 0
IV.ILOS.HHZ. 2021-07-28T17:35:59.28 3.0 positive manual Pn 4.98 0
IV.CAVE.HHZ. 2021-07-28T17:35:54.61 3.0 undecidable manual Sg 5.05 0
IV.GIZZ.HHZ. 2021-07-28T17:35:54.73 3.0 negative manual Pn 0.42 0
CH.FUSIO.HHZ. 2021-07-28T17:35:53.17 3.0 positive manual Pn 2.19 0
IV.VVLD.HHZ. 2021-07-28T17:35:24.95 3.0 undecidable manual S 0.11 0
IV.CSP1.EHZ. 2021-07-28T17:34:54.18 0.6 negative manual P 63 64.5909 50 0.08 46
IV.FDMO.HHZ. 2021-07-28T17:34:52.30 0.6 negative manual P 64 53.3022 50 -0.06 47
IV.ASSB.HHZ. 2021-07-28T17:34:52.25 0.3 undecidable manual S 29 27.2505 107 -0.01 76
IV.MML1.EHZ. 2021-07-28T17:34:51.80 0.6 undecidable manual P 50 49.9167 50 -0.05 48
IV.MGAB.HHZ. 2021-07-28T17:34:49.04 0.3 undecidable manual P 287 32.6451 104 -0.08 74
IV.CESI.HNN. 2021-07-28T17:34:49.99 0.6 undecidable manual P 59 38.5281 50 -0.1 48
IV.ASSB.HHZ. 2021-07-28T17:34:48.17 0.6 negative manual P 29 27.2505 107 0.09 49
IT.GNU.HGZ. 2021-07-28T17:34:45.90 0.3 undecidable manual S 114 6.5934 142 -0.15 76
IV.MOMA.HHZ. 2021-07-28T17:34:45.97 0.3 undecidable manual S 114 6.5934 142 -0.08 77
IT.GNU.HGZ. 2021-07-28T17:34:44.71 0.1 undecidable manual P 114 6.5934 142 0.21 100
IV.MOMA.HHZ. 2021-07-28T17:34:44.69 1.0 undecidable manual P 114 6.5934 142 0.19 25
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHE. ML:1.8 0.001187 0.36 AML other m 2021-07-28T17:34:46.25
IV.MOMA.HHN. ML:1.7 0.000886 0.74 AML other m 2021-07-28T17:34:46.90
IV.ASSB.HHE. ML:1.0 0.000054199999999999996 0.58 AML other m 2021-07-28T17:34:52.45
IV.ASSB.HHN. ML:1.0 0.0000535 0.2 AML other m 2021-07-28T17:34:52.52
IV.MGAB.HHE. ML:0.9 0.00003594999999999999 0.64 AML other m 2021-07-28T17:34:55.43
IV.MGAB.HHN. ML:1.1 0.00005395 0.92 AML other m 2021-07-28T17:34:55.77
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