Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 07-07-2021 and time 20:34:28 (Italy) in region 6 km W Montegallo (AP)

A magnitude ML 0.8 earthquake occured in region: 6 km W Montegallo (AP), on

  • 07-07-2021 18:34:28 (UTC)
  • 07-07-2021 20:34:28 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8620, 13.2640 at 16 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
Montegallo AP 6 523 523
Montemonaco AP 7 604 1127
Castelsantangelo sul Nera MC 10 281 1408
Arquata del Tronto AP 10 1178 2586
Montefortino FM 11 1178 3764
Ussita MC 14 444 4208
Bolognola MC 15 142 4350
Amandola FM 15 3629 7979
Acquasanta Terme AP 16 2916 10895
Norcia PG 16 4957 15852
Visso MC 16 1107 16959
Comunanza AP 16 3166 20125
Palmiano AP 17 196 20321
Roccafluvione AP 17 2010 22331
Preci PG 18 724 23055
Accumoli RI 19 667 23722
Venarotta AP 19 2066 25788
Sarnano MC 20 3264 29052
Acquacanina MC 20 121 29173

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km NW of Teramo (54892 inhabitants)
47 Km E of Foligno (57155 inhabitants)
58 Km N of L'Aquila (69753 inhabitants)
60 Km NE of Terni (111501 inhabitants)
76 Km E of Perugia (166134 inhabitants)
82 Km W of Montesilvano (53738 inhabitants)
87 Km S of Ancona (100861 inhabitants)
89 Km NW of Pescara (121014 inhabitants)
93 Km NW of Chieti (51815 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 0.8 2021-07-07
18:34:28		 42.8623 13.2637 16 2021-07-07
18:38:38		 Sala Sismica INGV-Roma 92376671
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-07 18:34:28 ± 0.13
Latitude 42.8623 ± 0.0045
Longitude 13.2637 ± 0.0061
Depth (km) 16 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 92376671

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 594
Semi-minor axis of confidence ellipse (meter) 177
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 50
Circular confidence region, given by single value of horizontal uncertainty (meter) 590.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 88
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 15
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) 0.34624
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 92376671
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-07 18:38:38
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MPAG.EHZ. 2021-07-07T18:34:56.98 1.0 undecidable manual S 0.2 0.41
IV.TERO.HHZ. 2021-07-07T18:34:41.29 0.3 undecidable manual S 134 38.4282 101 -0.11 70
IV.MML1.EHZ. 2021-07-07T18:34:40.90 0.3 undecidable manual S 320 36.5412 101 -0.03 72
IV.SMA1.EHZ. 2021-07-07T18:34:38.09 0.1 undecidable manual S 167 26.3514 108 -0.19 94
IV.FDMO.HHZ. 2021-07-07T18:34:37.46 0.1 undecidable manual S 324 24.0537 111 -0.24 93
IV.TERO.HHZ. 2021-07-07T18:34:36.28 0.1 undecidable manual P 134 38.4282 101 0.3 90
IV.NRCA.HHZ. 2021-07-07T18:34:35.00 0.1 undecidable manual S 255 12.5763 133 -0.07 99
IV.MML1.EHZ. 2021-07-07T18:34:35.64 1.0 positive manual P 320 36.5412 101 -0.06 24
IV.SMA1.EHZ. 2021-07-07T18:34:34.19 0.3 undecidable manual P 167 26.3514 108 0 73
IV.MC2.EHZ. 2021-07-07T18:34:34.62 0.1 undecidable manual S 312 8.1807 147 0.3 96
IV.CSP1.EHZ. 2021-07-07T18:34:34.06 3.0 positive manual P 0.15 0
IV.MMO1.EHZ. 2021-07-07T18:34:33.99 0.1 undecidable manual S 51 6.5934 153 -0.12 97
IV.FDMO.HHZ. 2021-07-07T18:34:33.73 0.3 positive manual P 324 24.0537 111 -0.12 72
IV.NRCA.HHZ. 2021-07-07T18:34:32.49 0.6 positive manual P 255 12.5763 133 0.16 48
IV.MC2.EHZ. 2021-07-07T18:34:32.14 0.6 positive manual P 312 8.1807 147 0.25 48
IV.MMO1.EHZ. 2021-07-07T18:34:31.76 0.1 undecidable manual P 51 6.5934 153 -0.01 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:0.9 0.0000642 0.08 AML other m 2021-07-07T18:34:35.24
IV.NRCA.HHN. ML:1.0 0.00007280000000000001 0.1 AML other m 2021-07-07T18:34:35.78
IV.FDMO.HHN. ML:0.7 0.0000239 0.38 AML other m 2021-07-07T18:34:37.92
IV.FDMO.HHE. ML:0.6 0.000021900000000000004 1.42 AML other m 2021-07-07T18:34:37.25
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