Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 26-03-2023 and time 00:59:12 (UTC) in region 1 km S Guardialfiera (CB)

A magnitude ML 1.1 earthquake occured in region: 1 km S Guardialfiera (CB), on

  • 26-03-2023 00:59:12 (UTC)
  • 26-03-2023 01:59:12 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.7960, 14.7940 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.

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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
Guardialfiera CB 1 1065 1065
Lupara CB 6 505 1570
Casacalenda CB 8 2135 3705
Castelmauro CB 8 1505 5210
Castelbottaccio CB 9 312 5522
Civitacampomarano CB 9 417 5939
Provvidenti CB 9 119 6058
Acquaviva Collecroce CB 9 672 6730
Morrone del Sannio CB 9 587 7317
Larino CB 10 6793 14110
Palata CB 10 1726 15836
Lucito CB 11 696 16532
Castellino del Biferno CB 12 545 17077
Ripabottoni CB 12 514 17591
Montorio nei Frentani CB 12 437 18028
Montecilfone CB 12 1348 19376
Tavenna CB 13 718 20094
San Felice del Molise CB 13 634 20728
Petrella Tifernina CB 14 1170 21898
Montelongo CB 15 365 22263
Montefalcone nel Sannio CB 15 1556 23819
Bonefro CB 16 1384 25203
Montemitro CB 16 395 25598
Guglionesi CB 16 5321 30919
Roccavivara CB 17 815 31734
Mafalda CB 18 1211 32945
Campolieto CB 18 839 33784
Montenero di Bisaccia CB 18 6675 40459
Ururi CB 18 2693 43152
Rotello CB 18 1212 44364
San Giuliano di Puglia CB 19 1042 45406
Santa Croce di Magliano CB 19 4435 49841
San Biase CB 19 189 50030
Tufillo CH 19 406 50436
Montagano CB 19 1086 51522
Limosano CB 19 768 52290
Sant'Angelo Limosano CB 19 352 52642
Celenza sul Trigno CH 20 915 53557
San Martino in Pensilis CB 20 4793 58350
San Giovanni Lipioni CH 20 185 58535

Municipalities with at least 50000 inhabitants

An earthquake occurred to
50 Km W of San Severo (53905 inhabitants)
73 Km NW of Foggia (151991 inhabitants)
74 Km N of Benevento (60091 inhabitants)
81 Km SE of Chieti (51815 inhabitants)
89 Km SE of Pescara (121014 inhabitants)
89 Km NE of Caserta (76326 inhabitants)
95 Km W of Manfredonia (57279 inhabitants)
96 Km SE of Montesilvano (53738 inhabitants)
98 Km N of Avellino (54857 inhabitants)
Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.1 2023-03-26
00:59:12		 41.7962 14.7942 10 2023-03-26
01:13:18		 Sala Sismica INGV-Roma 115736721
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-03-26 00:59:12 ± 0.69
Latitude 41.7962 ± 0.0297
Longitude 14.7942 ± 0.0205
Depth (km) 10 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 115736721

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 3342
Semi-minor axis of confidence ellipse (meter) 1448
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 164
Circular confidence region, given by single value of horizontal uncertainty (meter) 3340.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 259
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.44
Epicentral distance of station closest to the epicenter (degree) 0.16458
Epicentral distance of station farthest from the epicenter (degree) 0.29588
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 115736721
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-03-26 01:13:18
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.BSSO.HHZ. 2023-03-26T00:59:23.88 0.3 undecidable manual S 211 0.2914 50 0.08 78
IV.GATE.HHZ. 2023-03-26T00:59:23.56 0.6 undecidable manual S 163 0.2959 50 -0.37 49
IV.MELA.HHZ. 2023-03-26T00:59:23.13 0.3 undecidable manual S 110 0.2644 50 0.14 78
IV.CIGN.HHZ. 2023-03-26T00:59:20.22 0.3 undecidable manual S 150 0.1646 119 0.47 74
IV.BSSO.HHZ. 2023-03-26T00:59:19.31 0.1 undecidable manual P 211 0.2914 50 0.28 100
IV.MELA.HHZ. 2023-03-26T00:59:18.83 0.6 negative manual P 110 0.2644 50 0.27 50
IV.GATE.HHZ. 2023-03-26T00:59:18.44 0.6 negative manual P 163 0.2959 50 -0.67 45
IV.CIGN.HHZ. 2023-03-26T00:59:16.03 0.3 negative manual P 150 0.1646 119 -0.66 69
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CIGN.HHN. ML:1.6 0.000331 0.68 AML other m 2023-03-26T00:59:20.59
IV.CIGN.HHE. ML:1.6 0.0003185 0.8 AML other m 2023-03-26T00:59:22.45
IV.GATE.HHN. ML:0.9 0.00003625000000000001 0.44 AML other m 2023-03-26T00:59:28.84
IV.GATE.HHE. ML:1.1 0.00005525 0.42 AML other m 2023-03-26T00:59:33.25
IV.MELA.HHE. ML:1.0 0.000053908775 0.14 AML other m 2023-03-26T00:59:23.51
IV.MELA.HHN. ML:0.8 0.000037105935 0.12 AML other m 2023-03-26T00:59:23.75
IV.BSSO.HHE. ML:1.0 0.000046734335 0.3 AML other m 2023-03-26T00:59:24.47
IV.BSSO.HHN. ML:1.0 0.000041655595500000006 0.6 AML other m 2023-03-26T00:59:24.52
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, /tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download