MANUAL Location - Area: Appennino ligure , magnitude (ML): 0.2
2021-07-25 20:29:39 (UTC)

Regional Seismic Network of Northwestern Italy (Distav, University of Genoa)
Posted on: 2021-07-26 11:05:35

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Earthquake info - Manual location
Event - ID :210725202915
Magnitude (ML) :0.2 +/- 0.2
Origin Time :2021-07-25 20:29:39.867 (UTC)
Location : Latitude: 44.578 N, Longitude: 9.004 E
Area :Appennino ligure
Depth (km) :5.59
Distances (km) : 1.7 --- Crocefieschi
1.9 --- Savignone
3.8 --- Vobbia
4.6 --- Casella
4.6 --- Busalla
5.4 --- Valbrevenna
5.7 --- Ronco Scrivia
7.5 --- Montoggio
8.2 --- Mongiardino Ligure
8.7 --- Isola del Cantone
9.3 --- Serra Ricco
9.5 --- Mignanego
10.1 --- Fraconalto
10.8 --- Sant Olcese
11.3 --- Roccaforte Ligure
11.9 --- Ceranesi
11.9 --- Campomorone
13.0 --- Cabella Ligure
13.6 --- Grondona
13.7 --- Voltaggio

Quality location estimate: Erh: 2.1 km, Erz: 1.7 km, Nf: 8, Gap: 178 °, Rms: 0.07


Manual location results
Station Net P arrival time P pick
err
P pick
weight
P res Nll
weight
S arrival time S pick
err
S pick
weight
S res Nll
weight
Dist.
RNCAGU2021-07-25 20:29:42.7600.00800.011.322021-07-25 20:29:44.6450.1002-0.170.7513.9
GORRGU2021-07-25 20:29:44.7000.01200.011.332021-07-25 20:29:48.1280.0752-0.180.7223.9
PCPGU2021-07-25 20:29:46.5300.0190-0.041.262021-07-25 20:29:51.2330.1494-0.050.8637.2
MSSAIV2021-07-25 20:29:48.9930.02000.041.072021-07-25 20:29:55.4870.1975-0.110.6950.5


Local magnitude (ML) calculation results
Station Net Channels Stat. Mag. Wood-And.
Ampl.
Dist. (km) Azimuth
RNCA GUHH0.147.09e-213.9200
GORR GUHH0.505.99e-223.982
PCP GUHH0.019.20e-337.2264


Results of PGA, PGV, IH, spectral amplitudes (SA) values calculation
Station Net Channel PGA
(g)
PGV
(m/s)
IH 0*
(m)
IH 1*
(m)
IH 2*
(m)
Sa(T=0.10)
(g)
Sa(T=0.30)
(g)
Sa(T=1.00)
(g)
Sa(T=3.00)
(g)
Dist.
(km)
Azim.
(°)
RNCA GUHHZ9.6670e-68.6784e-73.5804e-71.2905e-76.0257e-81.4899e-51.6755e-61.1248e-71.6448e-813.9200
RNCA GUHHN6.2442e-68.2808e-74.9548e-71.4218e-76.3919e-81.4184e-52.3681e-69.8768e-81.9187e-813.9200
RNCA GUHHE1.0618e-51.2771e-66.7463e-71.6663e-79.0733e-81.7611e-53.1691e-61.4374e-72.9283e-813.9200
GORR GUHHZ8.2077e-68.7081e-72.6377e-71.0239e-73.8451e-88.3246e-61.1628e-65.7854e-89.1612e-923.982
GORR GUHHN5.4765e-67.3223e-74.9968e-71.9286e-78.0476e-81.0448e-52.0710e-61.0090e-71.7339e-823.982
GORR GUHHE6.3733e-68.0618e-75.3789e-71.7983e-71.0505e-71.8506e-51.6528e-61.6815e-72.3415e-823.982
PCP GUHHZ1.6963e-61.4598e-75.3216e-82.2725e-81.3751e-82.1216e-62.0857e-72.2453e-82.3796e-937.2264
PCP GUHHN1.3476e-61.3946e-77.4021e-83.1303e-81.9579e-81.6830e-62.9099e-72.9243e-82.8684e-937.2264
PCP GUHHE1.0795e-61.4281e-77.4102e-83.5368e-81.8376e-82.5847e-62.6931e-72.8237e-83.8266e-937.2264
MSSA IVHHZ2.6386e-62.9662e-76.9410e-82.9523e-83.0575e-86.4893e-63.0623e-75.1440e-85.3915e-950.5125
MSSA IVHHN5.5058e-69.2939e-72.5819e-76.3597e-84.2114e-83.0045e-57.6045e-78.1793e-81.9795e-850.5125
MSSA IVHHE9.2012e-61.4318e-64.0713e-71.1393e-77.6563e-83.7993e-51.2879e-61.5124e-73.1839e-850.5125
*IH (Housner Intensity) calculated on the velocity spectrum (SV) between 0.1 and 0.5 s (IH0), 0.1 and 1.0 s (IH1), 0.1 and 1.5 s (IH2)

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