Earthquake with magnitude of ML 1.2 on date 27-09-2021 and time 17:10:00 (Italy) in region 7 km NW Arquata del Tronto (AP)

A magnitude ML 1.2 earthquake occured in region: 7 km NW Arquata del Tronto (AP), on

  • 27-09-2021 15:10:00 (UTC)
  • 27-09-2021 17:10:00 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.813, 13.237 at 10 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
Arquata del Tronto AP 7 1178 1178
Montegallo AP 9 523 1701
Castelsantangelo sul Nera MC 11 281 1982
Norcia PG 12 4957 6939
Montemonaco AP 12 604 7543
Accumoli RI 13 667 8210
Acquasanta Terme AP 15 2916 11126
Ussita MC 17 444 11570
Montefortino FM 17 1178 12748
Preci PG 18 724 13472
Visso MC 18 1107 14579

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km W of Teramo (54892 inhabitants)
46 Km E of Foligno (57155 inhabitants)
53 Km N of L'Aquila (69753 inhabitants)
56 Km NE of Terni (111501 inhabitants)
76 Km E of Perugia (166134 inhabitants)
82 Km W of Montesilvano (53738 inhabitants)
89 Km W of Pescara (121014 inhabitants)
92 Km NW of Chieti (51815 inhabitants)
92 Km S of Ancona (100861 inhabitants)
100 Km NE of Guidonia Montecelio (88673 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
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 http://www.hsit.it. 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
Reviewed
Rev100
ML 1.2 2021-09-27
15:10:00
42.8128 13.2368 10 2021-09-27
15:15:24
Sala Sismica INGV-Roma 95950541
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-27 15:10:00 ± 0.06
Latitude 42.8128 ± 0.0036
Longitude 13.2368 ± 0.0049
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95950541

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 404
Semi-minor axis of confidence ellipse (meter) 371
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 104
Circular confidence region, given by single value of horizontal uncertainty (meter) 400
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 73
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.09173
Epicentral distance of station farthest from the epicenter (degree) 0.33005
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.4
Num. used stations 9
Type of magnitude ML
Reference to an origin 95950541
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-27 15:15:24
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.TERO.HHZ. 2021-09-27T15:10:12.71 0.6 undecidable manual S 125 0.3301 50 -0.37 45
IV.LNSS.HHZ. 2021-09-27T15:10:11.01 0.6 undecidable manual S 215 0.2545 50 0.16 48
IV.GAVE.EHZ. 2021-09-27T15:10:11.59 0.6 undecidable manual S 244 0.2788 50 0.02 49
IV.MF5.EHZ. 2021-09-27T15:10:11.02 0.6 undecidable manual S 43 0.2392 50 0.63 42
IV.GUMA.HHZ. 2021-09-27T15:10:11.37 0.6 undecidable manual S 16 0.2599 50 0.37 45
IV.SMA1.EHZ. 2021-09-27T15:10:08.62 0.6 undecidable manual S 158 0.1961 115 -0.34 46
IV.MTRA.HNZ. 2021-09-27T15:10:07.04 0.3 undecidable manual S 116 0.1295 125 0.3 71
IV.TERO.HHZ. 2021-09-27T15:10:07.85 1.0 undecidable manual P 125 0.3301 50 0.03 24
IV.CSP1.EHZ. 2021-09-27T15:10:06.55 0.6 undecidable manual P 355 0.2797 50 -0.41 45
IV.GUMA.HHZ. 2021-09-27T15:10:06.45 0.1 undecidable manual P 16 0.2599 50 -0.17 95
IV.LNSS.HHZ. 2021-09-27T15:10:06.80 0.1 undecidable manual P 215 0.2545 50 0.27 93
IV.GAVE.EHZ. 2021-09-27T15:10:06.72 0.6 undecidable manual P 244 0.2788 50 -0.23 47
IV.MC2.EHZ. 2021-09-27T15:10:06.01 0.6 undecidable manual S 340 0.1043 131 0.04 50
IV.MF5.EHZ. 2021-09-27T15:10:06.00 0.1 undecidable manual P 43 0.2392 50 -0.27 93
IV.MMO1.EHZ. 2021-09-27T15:10:05.92 0.6 undecidable manual S 37 0.1088 130 -0.17 49
IV.NRCA.HNZ. 2021-09-27T15:10:05.72 0.6 undecidable manual S 283 0.0917 135 0.1 50
IV.SMA1.EHZ. 2021-09-27T15:10:05.61 1.0 undecidable manual P 158 0.1961 115 0.17 24
IV.MTRA.HNZ. 2021-09-27T15:10:04.19 0.1 undecidable manual P 116 0.1295 125 0.03 100
IV.MC2.EHZ. 2021-09-27T15:10:03.80 1.0 undecidable manual P 340 0.1043 131 0.09 25
IV.MMO1.EHZ. 2021-09-27T15:10:03.80 0.3 undecidable manual P 37 0.1088 130 0.02 75
IV.NRCA.HNZ. 2021-09-27T15:10:03.45 0.1 undecidable manual P 283 0.0917 135 -0.06 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:0.5 2.0548635E-5 0.5888 AML other m 2021-09-27T15:10:09.16
IV.SMA1.EHN. ML:0.5 1.8489695E-5 1.3056 AML other m 2021-09-27T15:10:08.33
IV.CSP1.EHE. ML:1 5.147562E-5 0.8576 AML other m 2021-09-27T15:10:07.53
IV.GAVE.HNE. ML:1.4 0.0001319711 0.7936 AML other m 2021-09-27T15:10:12.75
IV.GAVE.HNN. ML:1.5 0.0001447194 1.088 AML other m 2021-09-27T15:10:11.60
IV.GAVE.EHE. ML:0.6 1.978951E-5 0.1664 AML other m 2021-09-27T15:10:13.64
IV.GAVE.EHN. ML:0.6 1.9542505E-5 0.2816 AML other m 2021-09-27T15:10:12.13
IV.TERO.HHE. ML:1.5 0.000123595695 0.4864 AML other m 2021-09-27T15:10:15.13
IV.TERO.HHN. ML:0.4 1.02700515E-5 1.408 AML other m 2021-09-27T15:10:13.33
IV.TERO.HNE. ML:1.2 6.465957E-5 0.384 AML other m 2021-09-27T15:10:12.38
IV.TERO.HNN. ML:1.5 0.000130049825 0.704 AML other m 2021-09-27T15:10:09.55
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