A possible inspiration for this piece was Johann Kuhnau's "Il tremor degl'Israeli". Kuhnau was Bach's predecessor in the Thomaskirche in Leipzig, so it's quite possible Bach was familiar with this piece. Look at the score here: http://partitura.org/index.php/bach-and-kuhnau-erbarm-dich-mein-bwv-721-and-il-tremore-deglisraliti/
Anyway, nice performance, though the solo was a bit thin to my ears.