Earthquake with magnitude of ML 1.7 on date 26-09-2021 and time 19:09:56 (Italy) in region 6 km W Roccaraso (AQ)

A magnitude ML 1.7 earthquake occured in region: 6 km W Roccaraso (AQ), on

  • 26-09-2021 17:09:56 (UTC)
  • 26-09-2021 19:09:56 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.827, 14.013 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Roccaraso AQ 6 1627 1627
Rivisondoli AQ 7 700 2327
Barrea AQ 8 726 3053
Pescocostanzo AQ 8 1128 4181
Villetta Barrea AQ 9 653 4834
Civitella Alfedena AQ 9 296 5130
Scontrone AQ 9 574 5704
Castel di Sangro AQ 9 6538 12242
Alfedena AQ 10 864 13106
Rocca Pia AQ 13 178 13284
Montenero Val Cocchiara IS 13 538 13822
Scanno AQ 14 1847 15669
San Pietro Avellana IS 15 503 16172
Ateleta AQ 16 1181 17353
Opi AQ 16 420 17773
Rionero Sannitico IS 17 1118 18891
Pettorano sul Gizio AQ 17 1376 20267
Pizzone IS 18 329 20596
Castel del Giudice IS 19 346 20942
Gamberale CH 19 320 21262
Pescasseroli AQ 19 2203 23465
Villalago AQ 19 568 24033
Castel San Vincenzo IS 20 516 24549
Cansano AQ 20 274 24823

Municipalities with at least 50000 inhabitants

An earthquake occurred to
60 Km S of Chieti (51815 inhabitants)
73 Km S of Pescara (121014 inhabitants)
77 Km SE of L'Aquila (69753 inhabitants)
77 Km S of Montesilvano (53738 inhabitants)
88 Km NW of Caserta (76326 inhabitants)
96 Km S of Teramo (54892 inhabitants)
96 Km N of Aversa (53047 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 1.7 2021-09-26
17:09:56
41.8268 14.0127 18 2021-09-26
17:16:55
Sala Sismica INGV-Roma 95914771
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-26 17:09:56 ± 0.11
Latitude 41.8268 ± 0.0036
Longitude 14.0127 ± 0.0048
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 95914771

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 428
Semi-minor axis of confidence ellipse (meter) 175
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 126
Circular confidence region, given by single value of horizontal uncertainty (meter) 430
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 106
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) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.14479
Epicentral distance of station farthest from the epicenter (degree) 0.43887
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:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 26
Type of magnitude ML
Reference to an origin 95914771
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-26 17:16:55
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.T0110.HHZ. 2021-09-26T17:10:12.32 0.6 undecidable manual S 337 0.4389 100 0.41 45
IV.MCI.EHZ. 2021-09-26T17:10:10.25 0.3 undecidable manual S 204 0.3669 103 0.41 68
IV.LRP.EHZ. 2021-09-26T17:10:09.72 0.6 undecidable manual S 241 0.3651 103 -0.06 48
IV.VVLD.HHZ. 2021-09-26T17:10:07.48 0.6 undecidable manual S 279 0.2932 108 -0.24 47
IV.POFI.HHZ. 2021-09-26T17:10:06.38 0.6 undecidable manual S 244 0.2491 112 -0.12 48
IV.LPEL.HHZ. 2021-09-26T17:10:06.41 0.6 undecidable manual S 30 0.2536 112 -0.21 48
IV.CERA.HHZ. 2021-09-26T17:10:05.98 0.6 undecidable manual S 179 0.2293 114 0.03 50
IV.T0110.HHZ. 2021-09-26T17:10:05.25 1.0 positive manual P 337 0.4389 100 -0.06 24
IV.INTR.HHZ. 2021-09-26T17:10:05.47 0.6 undecidable manual S 336 0.2014 119 0.26 48
IV.LRP.EHZ. 2021-09-26T17:10:03.91 0.6 positive manual P 241 0.3651 103 -0.17 47
IT.OPI.HGZ. 2021-09-26T17:10:03.84 0.6 undecidable manual S 250 0.1448 130 0.01 51
IV.RNI2.HHZ. 2021-09-26T17:10:03.87 0.6 undecidable manual S 140 0.1619 126 -0.34 48
IV.MCI.EHZ. 2021-09-26T17:10:03.92 0.6 undecidable manual P 204 0.3669 103 -0.19 47
IV.LPEL.HHZ. 2021-09-26T17:10:02.27 0.1 negative manual P 30 0.2536 112 0.01 100
IV.VVLD.HHZ. 2021-09-26T17:10:02.59 1.0 negative manual P 279 0.2932 108 -0.3 23
IV.MIDA.HHZ. 2021-09-26T17:10:02.17 0.1 negative manual P 136 0.2581 111 -0.15 97
IV.POFI.HHZ. 2021-09-26T17:10:02.06 0.6 undecidable manual P 244 0.2491 112 -0.13 48
IV.INTR.HHZ. 2021-09-26T17:10:01.54 0.1 negative manual P 336 0.2014 119 0.1 100
IV.CERA.HHZ. 2021-09-26T17:10:01.97 0.3 undecidable manual P 179 0.2293 114 0.1 74
IV.RNI2.HHZ. 2021-09-26T17:10:01.24 0.6 undecidable manual P 140 0.1619 126 0.37 47
IT.OPI.HGZ. 2021-09-26T17:10:00.70 0.3 negative manual P 250 0.1448 130 0.05 76
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.INTR.HHE. ML:1.5 0.0001762281 0.1408 AML other m 2021-09-26T17:10:05.96
IV.LPEL.HNN. ML:2 0.000414 0.12 AML other m 2021-09-26T17:10:06.90
IV.RNI2.HHE. ML:1.2 0.000104488485 0.4352 AML other m 2021-09-26T17:10:13.16
IV.LPEL.HHN. ML:2 0.0004525083 0.1408 AML other m 2021-09-26T17:10:06.92
IV.RNI2.HHN. ML:1.6 0.0002657933 0.1664 AML other m 2021-09-26T17:10:06.10
IV.LPEL.HNE. ML:1.9 0.0003625 0.1 AML other m 2021-09-26T17:10:07.45
IV.LPEL.HHE. ML:2 0.0004317295 0.1024 AML other m 2021-09-26T17:10:07.46
IV.VVLD.HHN. ML:1.8 0.0002666009 0.1664 AML other m 2021-09-26T17:10:08.86
IV.CERA.HHE. ML:1.4 0.0001151536 0.2816 AML other m 2021-09-26T17:10:08.02
IV.VVLD.HHE. ML:2 0.0003615 0.1 AML other m 2021-09-26T17:10:08.08
IV.CERA.HHN. ML:1.6 0.000193 0.16 AML other m 2021-09-26T17:10:08.18
IV.VVLD.HNN. ML:1.8 0.00026478085 0.1792 AML other m 2021-09-26T17:10:08.47
IV.VVLD.HNE. ML:1.9 0.00031811145 0.1024 AML other m 2021-09-26T17:10:08.08
IV.MIDA.HHE. ML:1.2 8.065066E-5 0.1536 AML other m 2021-09-26T17:10:08.93
IV.MIDA.HHN. ML:1.5 0.00012765844 0.2048 AML other m 2021-09-26T17:10:09.42
IV.LRP.EHN. ML:1.3 6.275E-5 0.24 AML other m 2021-09-26T17:10:10.91
IV.LRP.EHE. ML:1.7 0.0001585 0.2 AML other m 2021-09-26T17:10:11.30
IV.INTR.HHN. ML:1.5 0.00018361091 0.0768 AML other m 2021-09-26T17:10:11.90
IV.T0110.HHN. ML:1.6 0.00010530099 0.2816 AML other m 2021-09-26T17:10:15.72
IV.T0110.HHE. ML:1.7 0.000122 0.3 AML other m 2021-09-26T17:10:19.38
IV.INTR.HNE. ML:1.6 0.000195626955 0.1792 AML other m 2021-09-26T17:10:06.94
IV.INTR.HNN. ML:1.5 0.0001826932 0.2048 AML other m 2021-09-26T17:10:12.09
IV.CERA.HNE. ML:1.5 0.0001434194 0.3456 AML other m 2021-09-26T17:10:11.17
IV.CERA.HNN. ML:1.6 0.0001793814 0.2816 AML other m 2021-09-26T17:10:09.06
IV.MIDA.HNE. ML:1.4 0.00011726237 0.2048 AML other m 2021-09-26T17:10:09.42
IV.MIDA.HNN. ML:2 0.0005123457 1.5872 AML other m 2021-09-26T17:10:04.38
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